diff --git a/.coveragerc b/.coveragerc
index 9fdcce71f..5eace57be 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -1,6 +1,13 @@
 [run]
-# We don't want to include the tests themselves in the coverage report
-omit = graphql_compiler/tests/*
+omit =
+    # No coverage for tests
+    graphql_compiler/tests/*
+
+    # No coverage for SQL command generation script
+    scripts/generate_test_sql/*
+
+    # No coverage for snapshots.
+    **/snap_*.py
 
 [report]
 # Regexes for lines to exclude from consideration
diff --git a/.gitignore b/.gitignore
index e621c94d3..45508e04f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -43,3 +43,8 @@ tools/sphinx_docgen/docs_html
 # Python package publishing directories
 build/
 dist/
+
+# vim and swap files
+*.vim
+*.swp
+*.swo
diff --git a/.travis.yml b/.travis.yml
index e7fea7b95..5840092ee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,16 +4,21 @@ cache: pip
 python:
   - "2.7"
   - "3.6"
+services:
+  - docker
 install:
   - pip install -r dev-requirements.txt
   - pip install -e .
+before_script:
+  - docker-compose up -d
 script:
   - ./scripts/copyright_line_check.sh
   - isort --check-only --verbose --recursive graphql_compiler/
-  - flake8 graphql_compiler/
+  - flake8 --exclude **/snap_*.py graphql_compiler/
   - pydocstyle graphql_compiler/
   - pylint graphql_compiler/
   - bandit -r graphql_compiler/
   - py.test --cov=graphql_compiler graphql_compiler/tests
 after_success:
+  - docker-compose down
   - coveralls
diff --git a/dev-requirements.txt b/dev-requirements.txt
index 27bf9a136..d8afbb7b7 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -4,5 +4,7 @@ flake8==3.5.0
 isort==4.3.4
 pydocstyle==2.1.1
 pylint==1.8.2
+pyorient==1.5.5
 pytest==3.4.1
 pytest-cov==2.5.1
+snapshottest==0.5.0
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 000000000..0a72bcbe4
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,10 @@
+version: '3'
+services:
+  orientdb:
+    image: orientdb:2.2.30
+    command: server.sh
+    ports:
+      - "127.0.0.1:2480:2480"
+      - "127.0.0.1:2424:2424"
+    environment:
+      ORIENTDB_ROOT_PASSWORD: root
diff --git a/graphql_compiler/tests/conftest.py b/graphql_compiler/tests/conftest.py
new file mode 100644
index 000000000..91326a095
--- /dev/null
+++ b/graphql_compiler/tests/conftest.py
@@ -0,0 +1,40 @@
+# Copyright 2018-present Kensho Technologies, LLC.
+import sys
+import time
+
+import pytest
+
+from .test_data_tools.graph import get_test_graph
+
+
+# Pytest fixtures depend on name redefinitions to work,
+# so this check generates tons of false-positives here.
+# pylint: disable=redefined-outer-name
+
+
+@pytest.fixture(scope='session')
+def init_graph():
+    """Return a client for an initialized db, with all test data imported."""
+    graph_name = 'animals'
+
+    # Try to set up the database for the test up to 20 times before giving up.
+    set_up_successfully = False
+    for _ in range(20):
+        try:
+            graph_client = get_test_graph(graph_name)
+            set_up_successfully = True
+            break
+        except Exception as e:  # pylint: disable=broad-except
+            sys.stderr.write(u'Failed to set up test DB: {}'.format(e))
+            time.sleep(1)
+
+    if not set_up_successfully:
+        raise AssertionError(u'Failed to set up database without raising an exception!')
+
+    return graph_client
+
+
+@pytest.fixture(scope='class')
+def graph_client(request, init_graph):
+    """Get a client for an initialized db, with all test data imported."""
+    request.cls.graph_client = init_graph
diff --git a/graphql_compiler/tests/snapshot_tests/__init__.py b/graphql_compiler/tests/snapshot_tests/__init__.py
new file mode 100644
index 000000000..5bdcb1f8e
--- /dev/null
+++ b/graphql_compiler/tests/snapshot_tests/__init__.py
@@ -0,0 +1 @@
+# Copyright 2018-present Kensho Technologies, LLC.
diff --git a/graphql_compiler/tests/snapshot_tests/snapshots/__init__.py b/graphql_compiler/tests/snapshot_tests/snapshots/__init__.py
new file mode 100644
index 000000000..5bdcb1f8e
--- /dev/null
+++ b/graphql_compiler/tests/snapshot_tests/snapshots/__init__.py
@@ -0,0 +1 @@
+# Copyright 2018-present Kensho Technologies, LLC.
diff --git a/graphql_compiler/tests/snapshot_tests/snapshots/snap_test_orientdb_match_query.py b/graphql_compiler/tests/snapshot_tests/snapshots/snap_test_orientdb_match_query.py
new file mode 100644
index 000000000..ebb9599a9
--- /dev/null
+++ b/graphql_compiler/tests/snapshot_tests/snapshots/snap_test_orientdb_match_query.py
@@ -0,0 +1,23 @@
+# Copyright 2018-present Kensho Technologies, LLC.
+# -*- coding: utf-8 -*-
+# snapshottest: v1 - https://goo.gl/zC4yUc
+from __future__ import unicode_literals
+
+from snapshottest import Snapshot
+
+
+snapshots = Snapshot()
+
+snapshots['OrientDBMatchQueryTests::test_filter_in_optional_block 1'] = frozenset([(frozenset([('animal_name', 'Pteranodon__4')]), 1), (frozenset([('animal_name', 'Nazgul__3')]), 1), (frozenset([('parent_name', 'Nazgul__2'), ('animal_name', 'Nazgul__(234)'), ('uuid', '8b0163c1-cd9d-2b7d-247a-8333f7b0b7d2')]), 1), (frozenset([('animal_name', 'Nazgul__1')]), 1), (frozenset([('parent_name', 'Nazgul__2'), ('uuid', '8b0163c1-cd9d-2b7d-247a-8333f7b0b7d2'), ('animal_name', 'Nazgul__((013)24)')]), 1), (frozenset([('animal_name', 'Dragon__2')]), 1), (frozenset([('animal_name', 'Nazgul__0')]), 1), (frozenset([('animal_name', 'Hippogriff__4')]), 1), (frozenset([('animal_name', 'Dragon__3')]), 1), (frozenset([('parent_name', 'Nazgul__2'), ('animal_name', 'Nazgul__(024)'), ('uuid', '8b0163c1-cd9d-2b7d-247a-8333f7b0b7d2')]), 1), (frozenset([('animal_name', 'Hippogriff__2')]), 1), (frozenset([('animal_name', 'Dragon__1')]), 1), (frozenset([('animal_name', 'Dragon__0')]), 1), (frozenset([('animal_name', 'Nazgul__4')]), 1), (frozenset([('animal_name', 'Pteranodon__0')]), 1), (frozenset([('animal_name', 'Pteranodon__1')]), 1), (frozenset([('parent_name', 'Nazgul__2'), ('animal_name', 'Nazgul__((((234)34)01)24)'), ('uuid', '8b0163c1-cd9d-2b7d-247a-8333f7b0b7d2')]), 1), (frozenset([('animal_name', 'Hippogriff__0')]), 1), (frozenset([('animal_name', 'Dragon__4')]), 1), (frozenset([('animal_name', 'Pteranodon__3')]), 1), (frozenset([('animal_name', 'Hippogriff__1')]), 1), (frozenset([('animal_name', 'Hippogriff__3')]), 1), (frozenset([('animal_name', 'Pteranodon__2')]), 1), (frozenset([('animal_name', 'Nazgul__2')]), 1)])
+
+snapshots['OrientDBMatchQueryTests::test_fold_on_output_variable 1'] = frozenset([(frozenset([('child_names_list', ('Pteranodon__(((034)02)((034)04)3)', 'Pteranodon__(034)', 'Pteranodon__3')), ('animal_name', 'Pteranodon__((((034)02)((034)04)3)(034)3)')]), 1), (frozenset([('animal_name', 'Nazgul__((234)34)'), ('child_names_list', ('Nazgul__(234)', 'Nazgul__3', 'Nazgul__4'))]), 1), (frozenset([('child_names_list', ('Nazgul__0', 'Nazgul__2', 'Nazgul__4')), ('animal_name', 'Nazgul__(024)')]), 1), (frozenset([('animal_name', 'Nazgul__3'), ('child_names_list', ())]), 1), (frozenset([('child_names_list', ('Nazgul__((234)34)', 'Nazgul__0', 'Nazgul__1')), ('animal_name', 'Nazgul__(((234)34)01)')]), 1), (frozenset([('animal_name', 'Nazgul__((((234)34)01)24)'), ('child_names_list', ('Nazgul__(((234)34)01)', 'Nazgul__2', 'Nazgul__4'))]), 1), (frozenset([('animal_name', 'Dragon__((((((024)34)04)02)23)((024)34)(024))'), ('child_names_list', ('Dragon__(((((024)34)04)02)23)', 'Dragon__((024)34)', 'Dragon__(024)'))]), 1), (frozenset([('animal_name', 'Nazgul__2'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Hippogriff__((((((134)14)02)34)(134)0)((134)14)3)'), ('child_names_list', ('Hippogriff__(((((134)14)02)34)(134)0)', 'Hippogriff__((134)14)', 'Hippogriff__3'))]), 1), (frozenset([('child_names_list', ()), ('animal_name', 'Pteranodon__0')]), 1), (frozenset([('child_names_list', ('Hippogriff__((((134)14)02)34)', 'Hippogriff__(134)', 'Hippogriff__0')), ('animal_name', 'Hippogriff__(((((134)14)02)34)(134)0)')]), 1), (frozenset([('child_names_list', ()), ('animal_name', 'Hippogriff__0')]), 1), (frozenset([('animal_name', 'Pteranodon__4'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Hippogriff__4'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Dragon__(((((024)34)04)02)23)'), ('child_names_list', ('Dragon__((((024)34)04)02)', 'Dragon__2', 'Dragon__3'))]), 1), (frozenset([('animal_name', 'Dragon__(((024)12)(024)3)'), ('child_names_list', ('Dragon__((024)12)', 'Dragon__(024)', 'Dragon__3'))]), 1), (frozenset([('child_names_list', ('Pteranodon__((034)02)', 'Pteranodon__1', 'Pteranodon__3')), ('animal_name', 'Pteranodon__(((034)02)13)')]), 1), (frozenset([('child_names_list', ('Dragon__(024)', 'Dragon__3', 'Dragon__4')), ('animal_name', 'Dragon__((024)34)')]), 1), (frozenset([('child_names_list', ('Hippogriff__(134)', 'Hippogriff__1', 'Hippogriff__4')), ('animal_name', 'Hippogriff__((134)14)')]), 1), (frozenset([('animal_name', 'Dragon__((((024)34)04)02)'), ('child_names_list', ('Dragon__(((024)34)04)', 'Dragon__0', 'Dragon__2'))]), 1), (frozenset([('child_names_list', ('Nazgul__0', 'Nazgul__1', 'Nazgul__3')), ('animal_name', 'Nazgul__(013)')]), 1), (frozenset([('child_names_list', ('Hippogriff__(134)', 'Hippogriff__3', 'Hippogriff__4')), ('animal_name', 'Hippogriff__((134)34)')]), 1), (frozenset([('animal_name', 'Pteranodon__(((034)02)23)'), ('child_names_list', ('Pteranodon__((034)02)', 'Pteranodon__2', 'Pteranodon__3'))]), 1), (frozenset([('child_names_list', ('Dragon__0', 'Dragon__2', 'Dragon__4')), ('animal_name', 'Dragon__(024)')]), 1), (frozenset([('animal_name', 'Nazgul__((013)(234)0)'), ('child_names_list', ('Nazgul__(013)', 'Nazgul__(234)', 'Nazgul__0'))]), 1), (frozenset([('child_names_list', ('Hippogriff__0', 'Hippogriff__2', 'Hippogriff__4')), ('animal_name', 'Hippogriff__(024)')]), 1), (frozenset([('animal_name', 'Hippogriff__2'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Hippogriff__((((134)14)02)34)'), ('child_names_list', ('Hippogriff__(((134)14)02)', 'Hippogriff__3', 'Hippogriff__4'))]), 1), (frozenset([('animal_name', 'Hippogriff__(((134)14)02)'), ('child_names_list', ('Hippogriff__((134)14)', 'Hippogriff__0', 'Hippogriff__2'))]), 1), (frozenset([('child_names_list', ()), ('animal_name', 'Dragon__4')]), 1), (frozenset([('child_names_list', ()), ('animal_name', 'Hippogriff__1')]), 1), (frozenset([('child_names_list', ('Pteranodon__(034)', 'Pteranodon__0', 'Pteranodon__2')), ('animal_name', 'Pteranodon__((034)02)')]), 1), (frozenset([('animal_name', 'Dragon__0'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Pteranodon__((((034)02)13)(((034)02)23)(034))'), ('child_names_list', ('Pteranodon__(((034)02)13)', 'Pteranodon__(((034)02)23)', 'Pteranodon__(034)'))]), 1), (frozenset([('child_names_list', ('Nazgul__((013)(234)0)', 'Nazgul__((024)(234)3)', 'Nazgul__(024)')), ('animal_name', 'Nazgul__(((013)(234)0)((024)(234)3)(024))')]), 1), (frozenset([('animal_name', 'Pteranodon__((((034)02)13)13)'), ('child_names_list', ('Pteranodon__(((034)02)13)', 'Pteranodon__1', 'Pteranodon__3'))]), 1), (frozenset([('child_names_list', ()), ('animal_name', 'Dragon__1')]), 1), (frozenset([('child_names_list', ('Dragon__((024)34)', 'Dragon__0', 'Dragon__4')), ('animal_name', 'Dragon__(((024)34)04)')]), 1), (frozenset([('child_names_list', ('Pteranodon__(034)', 'Pteranodon__0', 'Pteranodon__4')), ('animal_name', 'Pteranodon__((034)04)')]), 1), (frozenset([('child_names_list', ('Nazgul__(024)', 'Nazgul__(234)', 'Nazgul__3')), ('animal_name', 'Nazgul__((024)(234)3)')]), 1), (frozenset([('child_names_list', ('Hippogriff__(((((134)14)02)34)(134)0)', 'Hippogriff__(134)', 'Hippogriff__4')), ('animal_name', 'Hippogriff__((((((134)14)02)34)(134)0)(134)4)')]), 1), (frozenset([('animal_name', 'Dragon__3'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Pteranodon__1'), ('child_names_list', ())]), 1), (frozenset([('child_names_list', ('Pteranodon__0', 'Pteranodon__3', 'Pteranodon__4')), ('animal_name', 'Pteranodon__(034)')]), 1), (frozenset([('child_names_list', ()), ('animal_name', 'Hippogriff__3')]), 1), (frozenset([('child_names_list', ('Dragon__((((024)34)04)02)', 'Dragon__((024)34)', 'Dragon__0')), ('animal_name', 'Dragon__(((((024)34)04)02)((024)34)0)')]), 1), (frozenset([('child_names_list', ('Dragon__(024)', 'Dragon__1', 'Dragon__2')), ('animal_name', 'Dragon__((024)12)')]), 1), (frozenset([('child_names_list', ('Dragon__(((((024)34)04)02)23)', 'Dragon__((((024)34)04)02)', 'Dragon__2')), ('animal_name', 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)')]), 1), (frozenset([('animal_name', 'Hippogriff__(134)'), ('child_names_list', ('Hippogriff__1', 'Hippogriff__3', 'Hippogriff__4'))]), 1), (frozenset([('child_names_list', ()), ('animal_name', 'Nazgul__4')]), 1), (frozenset([('animal_name', 'Nazgul__((013)24)'), ('child_names_list', ('Nazgul__(013)', 'Nazgul__2', 'Nazgul__4'))]), 1), (frozenset([('animal_name', 'Dragon__2'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Nazgul__0'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Hippogriff__((134)03)'), ('child_names_list', ('Hippogriff__(134)', 'Hippogriff__0', 'Hippogriff__3'))]), 1), (frozenset([('animal_name', 'Nazgul__(234)'), ('child_names_list', ('Nazgul__2', 'Nazgul__3', 'Nazgul__4'))]), 1), (frozenset([('animal_name', 'Pteranodon__2'), ('child_names_list', ())]), 1), (frozenset([('child_names_list', ()), ('animal_name', 'Nazgul__1')]), 1), (frozenset([('child_names_list', ('Pteranodon__((034)02)', 'Pteranodon__((034)04)', 'Pteranodon__3')), ('animal_name', 'Pteranodon__(((034)02)((034)04)3)')]), 1), (frozenset([('animal_name', 'Pteranodon__3'), ('child_names_list', ())]), 1), (frozenset([('animal_name', 'Pteranodon__(((((034)02)13)(((034)02)23)(034))(034)4)'), ('child_names_list', ('Pteranodon__((((034)02)13)(((034)02)23)(034))', 'Pteranodon__(034)', 'Pteranodon__4'))]), 1)])
+
+snapshots['OrientDBMatchQueryTests::test_immediate_output 1'] = frozenset([(frozenset([('animal_name', 'Nazgul__(((234)34)01)')]), 1), (frozenset([('animal_name', 'Nazgul__(024)')]), 1), (frozenset([('animal_name', 'Hippogriff__((((((134)14)02)34)(134)0)(134)4)')]), 1), (frozenset([('animal_name', 'Pteranodon__4')]), 1), (frozenset([('animal_name', 'Dragon__2')]), 1), (frozenset([('animal_name', 'Dragon__((((((024)34)04)02)23)((024)34)(024))')]), 1), (frozenset([('animal_name', 'Pteranodon__(((034)02)23)')]), 1), (frozenset([('animal_name', 'Nazgul__((013)(234)0)')]), 1), (frozenset([('animal_name', 'Hippogriff__((134)14)')]), 1), (frozenset([('animal_name', 'Dragon__((024)34)')]), 1), (frozenset([('animal_name', 'Nazgul__1')]), 1), (frozenset([('animal_name', 'Dragon__((((024)34)04)02)')]), 1), (frozenset([('animal_name', 'Hippogriff__(134)')]), 1), (frozenset([('animal_name', 'Nazgul__0')]), 1), (frozenset([('animal_name', 'Dragon__(((024)12)(024)3)')]), 1), (frozenset([('animal_name', 'Pteranodon__((034)04)')]), 1), (frozenset([('animal_name', 'Nazgul__(((013)(234)0)((024)(234)3)(024))')]), 1), (frozenset([('animal_name', 'Hippogriff__4')]), 1), (frozenset([('animal_name', 'Pteranodon__(((034)02)((034)04)3)')]), 1), (frozenset([('animal_name', 'Hippogriff__(((134)14)02)')]), 1), (frozenset([('animal_name', 'Hippogriff__(024)')]), 1), (frozenset([('animal_name', 'Dragon__3')]), 1), (frozenset([('animal_name', 'Pteranodon__((((034)02)13)(((034)02)23)(034))')]), 1), (frozenset([('animal_name', 'Hippogriff__(((((134)14)02)34)(134)0)')]), 1), (frozenset([('animal_name', 'Hippogriff__2')]), 1), (frozenset([('animal_name', 'Hippogriff__0')]), 1), (frozenset([('animal_name', 'Dragon__1')]), 1), (frozenset([('animal_name', 'Dragon__((024)12)')]), 1), (frozenset([('animal_name', 'Hippogriff__((134)34)')]), 1), (frozenset([('animal_name', 'Nazgul__3')]), 1), (frozenset([('animal_name', 'Dragon__(((((024)34)04)02)23)')]), 1), (frozenset([('animal_name', 'Dragon__0')]), 1), (frozenset([('animal_name', 'Nazgul__4')]), 1), (frozenset([('animal_name', 'Nazgul__((013)24)')]), 1), (frozenset([('animal_name', 'Pteranodon__((((034)02)13)13)')]), 1), (frozenset([('animal_name', 'Pteranodon__0')]), 1), (frozenset([('animal_name', 'Pteranodon__(((034)02)13)')]), 1), (frozenset([('animal_name', 'Nazgul__(013)')]), 1), (frozenset([('animal_name', 'Pteranodon__1')]), 1), (frozenset([('animal_name', 'Pteranodon__((034)02)')]), 1), (frozenset([('animal_name', 'Hippogriff__((((((134)14)02)34)(134)0)((134)14)3)')]), 1), (frozenset([('animal_name', 'Hippogriff__((134)03)')]), 1), (frozenset([('animal_name', 'Pteranodon__(((((034)02)13)(((034)02)23)(034))(034)4)')]), 1), (frozenset([('animal_name', 'Pteranodon__(034)')]), 1), (frozenset([('animal_name', 'Pteranodon__2')]), 1), (frozenset([('animal_name', 'Dragon__4')]), 1), (frozenset([('animal_name', 'Nazgul__(234)')]), 1), (frozenset([('animal_name', 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)')]), 1), (frozenset([('animal_name', 'Dragon__(((024)34)04)')]), 1), (frozenset([('animal_name', 'Pteranodon__((((034)02)((034)04)3)(034)3)')]), 1), (frozenset([('animal_name', 'Pteranodon__3')]), 1), (frozenset([('animal_name', 'Dragon__(024)')]), 1), (frozenset([('animal_name', 'Nazgul__((234)34)')]), 1), (frozenset([('animal_name', 'Hippogriff__1')]), 1), (frozenset([('animal_name', 'Nazgul__((((234)34)01)24)')]), 1), (frozenset([('animal_name', 'Hippogriff__3')]), 1), (frozenset([('animal_name', 'Hippogriff__((((134)14)02)34)')]), 1), (frozenset([('animal_name', 'Nazgul__2')]), 1), (frozenset([('animal_name', 'Nazgul__((024)(234)3)')]), 1), (frozenset([('animal_name', 'Dragon__(((((024)34)04)02)((024)34)0)')]), 1)])
+
+snapshots['OrientDBMatchQueryTests::test_optional_and_deep_traverse 1'] = frozenset([(frozenset([('spouse_and_self_name', 'Dragon__((((024)34)04)02)'), ('spouse_species', 'Dragon'), ('animal_name', 'Dragon__((((024)34)04)02)'), ('child_name', 'Dragon__(((((024)34)04)02)23)')]), 1), (frozenset([('animal_name', 'Hippogriff__4'), ('spouse_and_self_name', 'Hippogriff__4'), ('spouse_species', 'Hippogriff'), ('child_name', 'Hippogriff__((134)34)')]), 1), (frozenset([('child_name', 'Nazgul__(((013)(234)0)((024)(234)3)(024))'), ('spouse_species', 'Nazgul'), ('animal_name', 'Nazgul__((013)(234)0)'), ('spouse_and_self_name', 'Nazgul__((024)(234)3)')]), 1), (frozenset([('animal_name', 'Pteranodon__2'), ('spouse_and_self_name', 'Pteranodon__(034)'), ('child_name', 'Pteranodon__((034)02)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('spouse_and_self_name', 'Dragon__0'), ('spouse_species', 'Dragon'), ('child_name', 'Dragon__(024)'), ('animal_name', 'Dragon__4')]), 1), 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(frozenset([('child_name', 'Pteranodon__(((034)02)23)'), ('animal_name', 'Pteranodon__2'), ('spouse_and_self_name', 'Pteranodon__3'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('animal_name', 'Nazgul__(234)'), ('child_name', 'Nazgul__((013)(234)0)'), ('spouse_species', 'Nazgul'), ('spouse_and_self_name', 'Nazgul__(013)')]), 1), (frozenset([('animal_name', 'Hippogriff__(134)'), ('child_name', 'Hippogriff__(((((134)14)02)34)(134)0)'), ('spouse_species', 'Hippogriff'), ('spouse_and_self_name', 'Hippogriff__(134)')]), 1), (frozenset([('animal_name', 'Pteranodon__4'), ('spouse_and_self_name', 'Pteranodon__4'), ('child_name', 'Pteranodon__((034)04)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('spouse_and_self_name', 'Hippogriff__1'), ('animal_name', 'Hippogriff__4'), ('child_name', 'Hippogriff__((134)14)'), ('spouse_species', 'Hippogriff')]), 1), (frozenset([('spouse_and_self_name', 'Hippogriff__0'), ('spouse_species', 'Hippogriff'), ('child_name', 'Hippogriff__(024)'), ('animal_name', 'Hippogriff__0')]), 1), (frozenset([('animal_name', 'Hippogriff__4'), ('spouse_species', 'Hippogriff'), ('child_name', 'Hippogriff__((134)34)'), ('spouse_and_self_name', 'Hippogriff__3')]), 1), (frozenset([('child_name', 'Hippogriff__(((134)14)02)'), ('spouse_and_self_name', 'Hippogriff__2'), ('spouse_species', 'Hippogriff'), ('animal_name', 'Hippogriff__((134)14)')]), 1), (frozenset([('spouse_species', 'Nazgul'), ('child_name', 'Nazgul__((013)24)'), ('animal_name', 'Nazgul__4'), ('spouse_and_self_name', 'Nazgul__4')]), 1), (frozenset([('animal_name', 'Pteranodon__4'), ('spouse_and_self_name', 'Pteranodon__3'), ('child_name', 'Pteranodon__(034)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('child_name', 'Hippogriff__((134)03)'), ('spouse_and_self_name', 'Hippogriff__3'), ('spouse_species', 'Hippogriff'), ('animal_name', 'Hippogriff__0')]), 1), (frozenset([('child_name', 'Dragon__(((((024)34)04)02)((024)34)0)'), ('spouse_and_self_name', 'Dragon__0'), ('spouse_species', 'Dragon'), ('animal_name', 'Dragon__((((024)34)04)02)')]), 1), (frozenset([('spouse_species', 'Nazgul'), ('spouse_and_self_name', 'Nazgul__4'), ('animal_name', 'Nazgul__4'), ('child_name', 'Nazgul__((234)34)')]), 1), (frozenset([('spouse_species', 'Nazgul'), ('animal_name', 'Nazgul__3'), ('spouse_and_self_name', 'Nazgul__3'), ('child_name', 'Nazgul__((234)34)')]), 1), (frozenset([('child_name', 'Nazgul__(((013)(234)0)((024)(234)3)(024))'), ('spouse_species', 'Nazgul'), ('animal_name', 'Nazgul__(024)'), ('spouse_and_self_name', 'Nazgul__(024)')]), 1), (frozenset([('animal_name', 'Nazgul__(234)'), ('spouse_species', 'Nazgul'), ('spouse_and_self_name', 'Nazgul__4'), ('child_name', 'Nazgul__((234)34)')]), 1), (frozenset([('spouse_and_self_name', 'Dragon__0'), ('spouse_species', 'Dragon'), ('child_name', 'Dragon__(((024)34)04)'), ('animal_name', 'Dragon__4')]), 1), (frozenset([('child_name', 'Dragon__(((((024)34)04)02)((024)34)0)'), ('spouse_species', 'Dragon'), ('animal_name', 'Dragon__((024)34)'), ('spouse_and_self_name', 'Dragon__((024)34)')]), 1), (frozenset([('animal_name', 'Nazgul__(013)'), ('spouse_species', 'Nazgul'), ('child_name', 'Nazgul__((013)24)'), ('spouse_and_self_name', 'Nazgul__2')]), 1), (frozenset([('spouse_and_self_name', 'Dragon__3'), ('spouse_species', 'Dragon'), ('child_name', 'Dragon__((024)34)'), ('animal_name', 'Dragon__4')]), 1), (frozenset([('child_name', 'Hippogriff__(((134)14)02)'), ('spouse_species', 'Hippogriff'), ('spouse_and_self_name', 'Hippogriff__2'), ('animal_name', 'Hippogriff__0')]), 1), (frozenset([('animal_name', 'Pteranodon__3'), ('spouse_and_self_name', 'Pteranodon__3'), ('child_name', 'Pteranodon__(034)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('spouse_species', 'Dragon'), ('child_name', 'Dragon__((((024)34)04)02)'), ('animal_name', 'Dragon__(((024)34)04)'), ('spouse_and_self_name', 'Dragon__2')]), 1), (frozenset([('animal_name', 'Dragon__2'), ('child_name', 'Dragon__((024)12)'), ('spouse_species', 'Dragon'), ('spouse_and_self_name', 'Dragon__(024)')]), 1), (frozenset([('child_name', 'Pteranodon__((((034)02)13)(((034)02)23)(034))'), ('animal_name', 'Pteranodon__(034)'), ('spouse_and_self_name', 'Pteranodon__(034)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('spouse_and_self_name', 'Hippogriff__4'), ('spouse_species', 'Hippogriff'), ('animal_name', 'Hippogriff__3'), ('child_name', 'Hippogriff__(134)')]), 1), (frozenset([('spouse_species', 'Nazgul'), ('child_name', 'Nazgul__((((234)34)01)24)'), ('animal_name', 'Nazgul__(((234)34)01)'), ('spouse_and_self_name', 'Nazgul__2')]), 1), (frozenset([('child_name', 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)'), ('animal_name', 'Dragon__((((024)34)04)02)'), ('spouse_and_self_name', 'Dragon__(((((024)34)04)02)23)'), ('spouse_species', 'Dragon')]), 1), (frozenset([('animal_name', 'Nazgul__2'), ('spouse_species', 'Nazgul'), ('child_name', 'Nazgul__((013)24)'), ('spouse_and_self_name', 'Nazgul__4')]), 1), (frozenset([('animal_name', 'Dragon__0'), ('child_name', 'Dragon__(((024)34)04)'), ('spouse_species', 'Dragon'), ('spouse_and_self_name', 'Dragon__4')]), 1), (frozenset([('spouse_and_self_name', 'Dragon__3'), ('spouse_species', 'Dragon'), ('animal_name', 'Dragon__3'), ('child_name', 'Dragon__((024)34)')]), 1), (frozenset([('animal_name', 'Hippogriff__(134)'), ('child_name', 'Hippogriff__((134)34)'), ('spouse_and_self_name', 'Hippogriff__4'), ('spouse_species', 'Hippogriff')]), 1), (frozenset([('child_name', 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)'), ('animal_name', 'Dragon__(((((024)34)04)02)23)'), ('spouse_and_self_name', 'Dragon__(((((024)34)04)02)23)'), ('spouse_species', 'Dragon')]), 1), (frozenset([('spouse_species', 'Dragon'), ('animal_name', 'Dragon__((024)34)'), ('spouse_and_self_name', 'Dragon__((024)34)'), ('child_name', 'Dragon__(((024)34)04)')]), 1), (frozenset([('child_name', 'Hippogriff__((((((134)14)02)34)(134)0)(134)4)'), ('animal_name', 'Hippogriff__(((((134)14)02)34)(134)0)'), ('spouse_and_self_name', 'Hippogriff__4'), ('spouse_species', 'Hippogriff')]), 1), (frozenset([('animal_name', 'Pteranodon__3'), ('child_name', 'Pteranodon__(034)'), ('spouse_and_self_name', 'Pteranodon__0'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('child_name', 'Hippogriff__((134)34)'), ('spouse_species', 'Hippogriff'), ('animal_name', 'Hippogriff__3'), ('spouse_and_self_name', 'Hippogriff__3')]), 1), (frozenset([('animal_name', 'Hippogriff__(((((134)14)02)34)(134)0)'), ('child_name', 'Hippogriff__((((((134)14)02)34)(134)0)((134)14)3)'), ('spouse_and_self_name', 'Hippogriff__3'), ('spouse_species', 'Hippogriff')]), 1), (frozenset([('child_name', 'Dragon__(((((024)34)04)02)((024)34)0)'), ('spouse_species', 'Dragon'), ('animal_name', 'Dragon__((024)34)'), ('spouse_and_self_name', 'Dragon__((((024)34)04)02)')]), 1), (frozenset([('spouse_and_self_name', 'Hippogriff__0'), ('child_name', 'Hippogriff__((134)03)'), ('spouse_species', 'Hippogriff'), ('animal_name', 'Hippogriff__3')]), 1), (frozenset([('spouse_and_self_name', 'Pteranodon__((034)04)'), ('animal_name', 'Pteranodon__((034)04)'), ('child_name', 'Pteranodon__(((034)02)((034)04)3)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('animal_name', 'Nazgul__2'), ('spouse_species', 'Nazgul'), ('child_name', 'Nazgul__((((234)34)01)24)'), ('spouse_and_self_name', 'Nazgul__(((234)34)01)')]), 1), (frozenset([('spouse_and_self_name', 'Dragon__(024)'), ('spouse_species', 'Dragon'), ('animal_name', 'Dragon__(024)'), ('child_name', 'Dragon__((024)34)')]), 1), (frozenset([('spouse_species', 'Hippogriff'), ('child_name', 'Hippogriff__(024)'), ('spouse_and_self_name', 'Hippogriff__2'), ('animal_name', 'Hippogriff__0')]), 1), (frozenset([('animal_name', 'Pteranodon__4'), ('spouse_and_self_name', 'Pteranodon__4'), ('child_name', 'Pteranodon__(034)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('animal_name', 'Dragon__2'), ('spouse_species', 'Dragon'), ('child_name', 'Dragon__((((024)34)04)02)'), ('spouse_and_self_name', 'Dragon__(((024)34)04)')]), 1), (frozenset([('child_name', 'Hippogriff__(((134)14)02)'), ('spouse_and_self_name', 'Hippogriff__((134)14)'), ('spouse_species', 'Hippogriff'), ('animal_name', 'Hippogriff__0')]), 1), (frozenset([('animal_name', 'Dragon__2'), ('spouse_species', 'Dragon'), ('child_name', 'Dragon__((((024)34)04)02)'), ('spouse_and_self_name', 'Dragon__2')]), 1), (frozenset([('spouse_and_self_name', 'Dragon__0'), ('spouse_species', 'Dragon'), ('animal_name', 'Dragon__((024)34)'), ('child_name', 'Dragon__(((024)34)04)')]), 1), (frozenset([('child_name', 'Pteranodon__(((034)02)23)'), ('spouse_and_self_name', 'Pteranodon__((034)02)'), ('animal_name', 'Pteranodon__((034)02)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('animal_name', 'Nazgul__2'), ('spouse_species', 'Nazgul'), ('child_name', 'Nazgul__((013)24)'), ('spouse_and_self_name', 'Nazgul__(013)')]), 1), (frozenset([('animal_name', 'Hippogriff__(((134)14)02)'), ('child_name', 'Hippogriff__((((134)14)02)34)'), ('spouse_species', 'Hippogriff'), ('spouse_and_self_name', 'Hippogriff__3')]), 1), (frozenset([('animal_name', 'Hippogriff__(134)'), ('spouse_and_self_name', 'Hippogriff__4'), ('child_name', 'Hippogriff__((134)14)'), ('spouse_species', 'Hippogriff')]), 1), (frozenset([('spouse_species', 'Dragon'), ('animal_name', 'Dragon__(024)'), ('spouse_and_self_name', 'Dragon__(024)'), ('child_name', 'Dragon__((((((024)34)04)02)23)((024)34)(024))')]), 1), (frozenset([('child_name', 'Nazgul__(234)'), ('spouse_species', 'Nazgul'), ('animal_name', 'Nazgul__3'), ('spouse_and_self_name', 'Nazgul__2')]), 1), (frozenset([('animal_name', 'Pteranodon__3'), ('child_name', 'Pteranodon__(((034)02)13)'), ('spouse_and_self_name', 'Pteranodon__3'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('child_name', 'Dragon__((024)12)'), ('spouse_species', 'Dragon'), ('spouse_and_self_name', 'Dragon__(024)'), ('animal_name', 'Dragon__1')]), 1), (frozenset([('spouse_and_self_name', 'Pteranodon__((034)04)'), ('child_name', 'Pteranodon__(((034)02)((034)04)3)'), ('animal_name', 'Pteranodon__((034)02)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('spouse_and_self_name', 'Pteranodon__(034)'), ('child_name', 'Pteranodon__((((034)02)((034)04)3)(034)3)'), ('animal_name', 'Pteranodon__(((034)02)((034)04)3)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('animal_name', 'Nazgul__2'), ('child_name', 'Nazgul__(234)'), ('spouse_species', 'Nazgul'), ('spouse_and_self_name', 'Nazgul__3')]), 1), (frozenset([('spouse_species', 'Hippogriff'), ('spouse_and_self_name', 'Hippogriff__4'), ('child_name', 'Hippogriff__(024)'), ('animal_name', 'Hippogriff__0')]), 1), (frozenset([('animal_name', 'Pteranodon__3'), ('child_name', 'Pteranodon__((((034)02)((034)04)3)(034)3)'), ('spouse_and_self_name', 'Pteranodon__(((034)02)((034)04)3)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('animal_name', 'Hippogriff__4'), ('spouse_and_self_name', 'Hippogriff__4'), ('child_name', 'Hippogriff__(024)'), ('spouse_species', 'Hippogriff')]), 1), (frozenset([('spouse_and_self_name', 'Hippogriff__(134)'), ('animal_name', 'Hippogriff__1'), ('child_name', 'Hippogriff__((134)14)'), ('spouse_species', 'Hippogriff')]), 1), (frozenset([('child_name', 'Nazgul__(234)'), ('spouse_species', 'Nazgul'), ('animal_name', 'Nazgul__3'), ('spouse_and_self_name', 'Nazgul__4')]), 1), (frozenset([('animal_name', 'Pteranodon__(034)'), ('spouse_and_self_name', 'Pteranodon__2'), ('child_name', 'Pteranodon__((034)02)'), ('spouse_species', 'Pteranodon')]), 1), (frozenset([('animal_name', 'Hippogriff__(134)'), ('child_name', 'Hippogriff__((134)03)'), ('spouse_species', 'Hippogriff'), ('spouse_and_self_name', 'Hippogriff__(134)')]), 1), (frozenset([('spouse_and_self_name', 'Hippogriff__4'), ('animal_name', 'Hippogriff__1'), ('child_name', 'Hippogriff__((134)14)'), ('spouse_species', 'Hippogriff')]), 1), (frozenset([('child_name', 'Dragon__((024)12)'), ('spouse_species', 'Dragon'), ('animal_name', 'Dragon__1'), ('spouse_and_self_name', 'Dragon__1')]), 1), (frozenset([('spouse_species', 'Nazgul'), ('child_name', 'Nazgul__(013)'), ('animal_name', 'Nazgul__1'), ('spouse_and_self_name', 'Nazgul__0')]), 1), (frozenset([('spouse_species', 'Dragon'), ('animal_name', 'Dragon__(024)'), ('spouse_and_self_name', 'Dragon__((024)34)'), ('child_name', 'Dragon__((((((024)34)04)02)23)((024)34)(024))')]), 1), (frozenset([('spouse_species', 'Dragon'), ('animal_name', 'Dragon__(024)'), ('spouse_and_self_name', 'Dragon__3'), ('child_name', 'Dragon__(((024)12)(024)3)')]), 1), (frozenset([('child_name', 'Hippogriff__((134)03)'), ('spouse_species', 'Hippogriff'), ('animal_name', 'Hippogriff__3'), ('spouse_and_self_name', 'Hippogriff__3')]), 1)])
+
+snapshots['OrientDBMatchQueryTests::test_optional_traverse_after_mandatory_traverse 1'] = frozenset([(frozenset([('child_name', 'Pteranodon__1'), ('species_name', 'Pteranodon')]), 2), (frozenset([('child_name', 'Pteranodon__2'), ('species_name', 'Pteranodon')]), 2), (frozenset([('child_name', 'Dragon__0'), ('species_name', 'Dragon')]), 4), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__((234)34)')]), 1), (frozenset([('species_name', 'Dragon')]), 5), (frozenset([('child_name', 'Hippogriff__((((134)14)02)34)'), ('species_name', 'Hippogriff')]), 1), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__(((234)34)01)')]), 1), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__(024)')]), 2), (frozenset([('child_name', 'Nazgul__0'), ('species_name', 'Nazgul')]), 4), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__4')]), 3), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__((((024)34)04)02)')]), 3), (frozenset([('child_name', 'Pteranodon__0'), ('species_name', 'Pteranodon')]), 3), (frozenset([('species_name', 'Pteranodon')]), 5), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__((024)34)')]), 3), (frozenset([('child_name', 'Hippogriff__((134)14)'), ('species_name', 'Hippogriff')]), 2), (frozenset([('child_name', 'Pteranodon__(((034)02)23)'), ('species_name', 'Pteranodon')]), 1), (frozenset([('child_name', 'Pteranodon__((034)04)'), ('species_name', 'Pteranodon')]), 1), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__1')]), 2), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__3')]), 3), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__3')]), 4), (frozenset([('child_name', 'Hippogriff__0'), ('species_name', 'Hippogriff')]), 4), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__4')]), 5), (frozenset([('child_name', 'Nazgul__(013)'), ('species_name', 'Nazgul')]), 2), (frozenset([('child_name', 'Dragon__((024)12)'), ('species_name', 'Dragon')]), 1), (frozenset([('child_name', 'Hippogriff__(((((134)14)02)34)(134)0)'), ('species_name', 'Hippogriff')]), 2), (frozenset([('child_name', 'Pteranodon__4'), ('species_name', 'Pteranodon')]), 3), (frozenset([('child_name', 'Pteranodon__(((034)02)((034)04)3)'), ('species_name', 'Pteranodon')]), 1), (frozenset([('species_name', 'Hippogriff'), ('child_name', 'Hippogriff__(134)')]), 5), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__((024)(234)3)')]), 1), (frozenset([('species_name', 'Hippogriff')]), 5), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__2')]), 5), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__(024)')]), 4), (frozenset([('child_name', 'Hippogriff__(((134)14)02)'), ('species_name', 'Hippogriff')]), 1), (frozenset([('child_name', 'Pteranodon__(034)'), ('species_name', 'Pteranodon')]), 5), (frozenset([('child_name', 'Hippogriff__3'), ('species_name', 'Hippogriff')]), 5), (frozenset([('species_name', 'Pteranodon'), ('child_name', 'Pteranodon__3')]), 6), (frozenset([('child_name', 'Pteranodon__(((034)02)13)'), ('species_name', 'Pteranodon')]), 2), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__(((((024)34)04)02)23)')]), 2), (frozenset([('child_name', 'Pteranodon__((034)02)'), ('species_name', 'Pteranodon')]), 3), (frozenset([('species_name', 'Nazgul')]), 5), (frozenset([('child_name', 'Hippogriff__1'), ('species_name', 'Hippogriff')]), 2), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__((013)(234)0)')]), 1), (frozenset([('species_name', 'Nazgul'), ('child_name', 'Nazgul__2')]), 4), (frozenset([('child_name', 'Nazgul__(234)'), ('species_name', 'Nazgul')]), 3), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__(((024)34)04)')]), 1), (frozenset([('child_name', 'Hippogriff__4'), ('species_name', 'Hippogriff')]), 6), (frozenset([('child_name', 'Hippogriff__2'), ('species_name', 'Hippogriff')]), 2), (frozenset([('species_name', 'Dragon'), ('child_name', 'Dragon__1')]), 1), (frozenset([('child_name', 'Pteranodon__((((034)02)13)(((034)02)23)(034))'), ('species_name', 'Pteranodon')]), 1)])
+
+snapshots['OrientDBMatchQueryTests::test_traverse_and_output 1'] = frozenset([(frozenset([('parent_name', 'Nazgul__2')]), 4), (frozenset([('parent_name', 'Dragon__4')]), 3), (frozenset([('parent_name', 'Nazgul__((024)(234)3)')]), 1), (frozenset([('parent_name', 'Pteranodon__0')]), 3), (frozenset([('parent_name', 'Pteranodon__((034)04)')]), 1), (frozenset([('parent_name', 'Hippogriff__1')]), 2), (frozenset([('parent_name', 'Pteranodon__((((034)02)13)(((034)02)23)(034))')]), 1), (frozenset([('parent_name', 'Pteranodon__((034)02)')]), 3), (frozenset([('parent_name', 'Pteranodon__(((034)02)23)')]), 1), (frozenset([('parent_name', 'Nazgul__((013)(234)0)')]), 1), (frozenset([('parent_name', 'Dragon__((024)34)')]), 3), (frozenset([('parent_name', 'Pteranodon__2')]), 2), (frozenset([('parent_name', 'Pteranodon__(034)')]), 5), (frozenset([('parent_name', 'Nazgul__(013)')]), 2), (frozenset([('parent_name', 'Nazgul__(((234)34)01)')]), 1), (frozenset([('parent_name', 'Hippogriff__2')]), 2), (frozenset([('parent_name', 'Pteranodon__(((034)02)13)')]), 2), (frozenset([('parent_name', 'Hippogriff__((134)14)')]), 2), (frozenset([('parent_name', 'Nazgul__(234)')]), 3), (frozenset([('parent_name', 'Hippogriff__4')]), 6), (frozenset([('parent_name', 'Nazgul__((234)34)')]), 1), (frozenset([('parent_name', 'Hippogriff__((((134)14)02)34)')]), 1), (frozenset([('parent_name', 'Nazgul__(024)')]), 2), (frozenset([('parent_name', 'Hippogriff__0')]), 4), (frozenset([('parent_name', 'Pteranodon__3')]), 6), (frozenset([('parent_name', 'Nazgul__1')]), 2), (frozenset([('parent_name', 'Dragon__0')]), 4), (frozenset([('parent_name', 'Hippogriff__3')]), 5), (frozenset([('parent_name', 'Dragon__3')]), 3), (frozenset([('parent_name', 'Nazgul__3')]), 4), (frozenset([('parent_name', 'Dragon__1')]), 1), (frozenset([('parent_name', 'Nazgul__4')]), 5), (frozenset([('parent_name', 'Dragon__((024)12)')]), 1), (frozenset([('parent_name', 'Pteranodon__4')]), 3), (frozenset([('parent_name', 'Dragon__(((((024)34)04)02)23)')]), 2), (frozenset([('parent_name', 'Dragon__((((024)34)04)02)')]), 3), (frozenset([('parent_name', 'Pteranodon__(((034)02)((034)04)3)')]), 1), (frozenset([('parent_name', 'Hippogriff__(134)')]), 5), (frozenset([('parent_name', 'Hippogriff__(((134)14)02)')]), 1), (frozenset([('parent_name', 'Dragon__(((024)34)04)')]), 1), (frozenset([('parent_name', 'Pteranodon__1')]), 2), (frozenset([('parent_name', 'Dragon__(024)')]), 4), (frozenset([('parent_name', 'Nazgul__0')]), 4), (frozenset([('parent_name', 'Hippogriff__(((((134)14)02)34)(134)0)')]), 2), (frozenset([('parent_name', 'Dragon__2')]), 5)])
+
+snapshots['OrientDBMatchQueryTests::test_traverse_filter_and_output 1'] = frozenset([(frozenset([('parent_name', 'Nazgul__2')]), 4)])
diff --git a/graphql_compiler/tests/snapshot_tests/test_orientdb_match_query.py b/graphql_compiler/tests/snapshot_tests/test_orientdb_match_query.py
new file mode 100644
index 000000000..6e3f76063
--- /dev/null
+++ b/graphql_compiler/tests/snapshot_tests/test_orientdb_match_query.py
@@ -0,0 +1,125 @@
+# Copyright 2018-present Kensho Technologies, LLC.
+from collections import Counter
+
+import pytest
+import six
+from snapshottest import TestCase
+
+from .. import test_input_data
+from ... import graphql_to_match
+from ..test_helpers import get_schema
+
+
+def execute_graphql(schema, test_data, client, sample_parameters):
+    """Compile the GraphQL query to MATCH, execute it agains the test_db, and return the results."""
+    if test_data.type_equivalence_hints:
+        # For test convenience, we accept the type equivalence hints in string form.
+        # Here, we convert them to the required GraphQL types.
+        schema_based_type_equivalence_hints = {
+            schema.get_type(key): schema.get_type(value)
+            for key, value in six.iteritems(test_data.type_equivalence_hints)
+        }
+    else:
+        schema_based_type_equivalence_hints = None
+
+    result = graphql_to_match(schema, test_data.graphql_input, sample_parameters,
+                              type_equivalence_hints=schema_based_type_equivalence_hints)
+
+    # We need to preprocess the results to be agnostic of the returned order.
+    # For this we perform the following steps
+    # - convert lists (returned from @fold scopes) to tuples to make them hashable
+    # - convert each row dict to a frozenset of its items
+    # - create a Counter (multi-set) of the row frozensets
+    # - convert the multi-set to a frozenset of its items
+    row_dicts = [row.oRecordData for row in client.command(result.query)]
+    row_dicts_using_tuples = [
+        {
+            column_name: tuple(value) if isinstance(value, list) else value
+            for column_name, value in row.items()
+        }
+        for row in row_dicts
+    ]
+    row_frozensets = [frozenset(row_dict.items()) for row_dict in row_dicts_using_tuples]
+    rows_multiset = Counter(row_frozensets)
+    row_counters_frozenset = frozenset(rows_multiset.items())
+
+    return row_counters_frozenset
+
+
+# The following TestCase class uses the 'graph_client' fixture
+# which pylint does not recognize as a class member.
+# pylint: disable=no-member
+
+
+class OrientDBMatchQueryTests(TestCase):
+
+    def setUp(self):
+        """Initialize the test schema once for all tests, and disable max diff limits."""
+        self.maxDiff = None
+        self.schema = get_schema()
+
+    @pytest.mark.usefixtures('graph_client')
+    def test_immediate_output(self):
+        test_data = test_input_data.immediate_output()
+        sample_parameters = {}
+
+        rows = execute_graphql(self.schema, test_data, self.graph_client, sample_parameters)
+
+        self.assertMatchSnapshot(rows)
+
+    @pytest.mark.usefixtures('graph_client')
+    def test_traverse_and_output(self):
+        test_data = test_input_data.traverse_and_output()
+        sample_parameters = {}
+
+        rows = execute_graphql(self.schema, test_data, self.graph_client, sample_parameters)
+
+        self.assertMatchSnapshot(rows)
+
+    @pytest.mark.usefixtures('graph_client')
+    def test_traverse_filter_and_output(self):
+        test_data = test_input_data.traverse_filter_and_output()
+        sample_parameters = {'wanted': 'Nazgul__2'}
+
+        rows = execute_graphql(self.schema, test_data, self.graph_client, sample_parameters)
+
+        self.assertMatchSnapshot(rows)
+
+    @pytest.mark.usefixtures('graph_client')
+    def test_filter_in_optional_block(self):
+        test_data = test_input_data.filter_in_optional_block()
+        sample_parameters = {'name': 'Nazgul__2'}
+
+        rows = execute_graphql(self.schema, test_data, self.graph_client, sample_parameters)
+
+        self.assertMatchSnapshot(rows)
+
+    @pytest.mark.usefixtures('graph_client')
+    def test_optional_traverse_after_mandatory_traverse(self):
+        test_data = test_input_data.optional_traverse_after_mandatory_traverse()
+        sample_parameters = {}
+
+        rows = execute_graphql(self.schema, test_data, self.graph_client, sample_parameters)
+
+        self.assertMatchSnapshot(rows)
+
+    @pytest.mark.usefixtures('graph_client')
+    def test_optional_and_deep_traverse(self):
+        test_data = test_input_data.optional_and_deep_traverse()
+        sample_parameters = {}
+
+        rows = execute_graphql(self.schema, test_data, self.graph_client, sample_parameters)
+
+        self.assertMatchSnapshot(rows)
+
+    @pytest.mark.usefixtures('graph_client')
+    def test_fold_on_output_variable(self):
+        test_data = test_input_data.fold_on_output_variable()
+        sample_parameters = {}
+
+        rows = execute_graphql(self.schema, test_data, self.graph_client, sample_parameters)
+
+        self.assertMatchSnapshot(rows)
+
+
+# pylint: enable=no-member
diff --git a/graphql_compiler/tests/test_compiler.py b/graphql_compiler/tests/test_compiler.py
index 4c7dc7076..14557a9bf 100644
--- a/graphql_compiler/tests/test_compiler.py
+++ b/graphql_compiler/tests/test_compiler.py
@@ -501,40 +501,46 @@ def test_filter_in_optional_block(self):
 
         expected_match = '''
             SELECT
-                if(eval("(Animal__out_Animal_FedAt___1 IS NOT null)"),
-                   Animal__out_Animal_FedAt___1.uuid, null) AS `uuid`
+                Animal___1.name AS `animal_name`,
+                if(eval("(Animal__out_Animal_ParentOf___1 IS NOT null)"),
+                   Animal__out_Animal_ParentOf___1.name, null) AS `parent_name`,
+                if(eval("(Animal__out_Animal_ParentOf___1 IS NOT null)"),
+                   Animal__out_Animal_ParentOf___1.uuid, null) AS `uuid`
             FROM (
                 MATCH {{
                     class: Animal,
                     as: Animal___1
-                }}.out('Animal_FedAt') {{
+                }}.out('Animal_ParentOf') {{
                     where: ((name = {name})),
                     optional: true,
-                    as: Animal__out_Animal_FedAt___1
+                    as: Animal__out_Animal_ParentOf___1
                 }}
                 RETURN $matches
             )
             WHERE (
                 (
-                    (Animal___1.out_Animal_FedAt IS null)
+                    (Animal___1.out_Animal_ParentOf IS null)
                     OR
-                    (Animal___1.out_Animal_FedAt.size() = 0)
+                    (Animal___1.out_Animal_ParentOf.size() = 0)
                 )
                 OR
-                (Animal__out_Animal_FedAt___1 IS NOT null)
+                (Animal__out_Animal_ParentOf___1 IS NOT null)
             )
         '''
         expected_gremlin = '''
             g.V('@class', 'Animal')
             .as('Animal___1')
-            .ifThenElse{it.out_Animal_FedAt == null}{null}{it.out('Animal_FedAt')}
+            .ifThenElse{it.out_Animal_ParentOf == null}{null}{it.out('Animal_ParentOf')}
             .filter{it, m -> ((it == null) || (it.name == $name))}
-            .as('Animal__out_Animal_FedAt___1')
+            .as('Animal__out_Animal_ParentOf___1')
             .optional('Animal___1')
             .as('Animal___2')
             .transform{it, m -> new com.orientechnologies.orient.core.record.impl.ODocument([
-                uuid: ((m.Animal__out_Animal_FedAt___1 != null) ?
-                       m.Animal__out_Animal_FedAt___1.uuid : null)
+                animal_name: m.Animal___1.name,
+                parent_name: ((m.Animal__out_Animal_ParentOf___1 != null) ?
+                                 m.Animal__out_Animal_ParentOf___1.name : null),
+                uuid: ((m.Animal__out_Animal_ParentOf___1 != null) ?
+                          m.Animal__out_Animal_ParentOf___1.uuid : null)
             ])}
         '''
 
diff --git a/graphql_compiler/tests/test_data_tools/__init__.py b/graphql_compiler/tests/test_data_tools/__init__.py
new file mode 100644
index 000000000..5bdcb1f8e
--- /dev/null
+++ b/graphql_compiler/tests/test_data_tools/__init__.py
@@ -0,0 +1 @@
+# Copyright 2018-present Kensho Technologies, LLC.
diff --git a/graphql_compiler/tests/test_data_tools/data/commands.sql b/graphql_compiler/tests/test_data_tools/data/commands.sql
new file mode 100644
index 000000000..802ad19c6
--- /dev/null
+++ b/graphql_compiler/tests/test_data_tools/data/commands.sql
@@ -0,0 +1,248 @@
+# Auto-generated output from `generate_test_sql/__init__.py`.
+# Do not edit directly!
+# Generated on 2018-07-17T13:02:38.056485 from compiler version 1.6.2.
+
+create vertex Species set limbs = 9, name = 'Nazgul', uuid = '0a5d2f34-6baa-9455-e3e7-0682c2094cac'
+create vertex Species set limbs = 10, name = 'Pteranodon', uuid = '81332876-37eb-dcd9-e87a-1613e443df78'
+create vertex Species set limbs = 4, name = 'Dragon', uuid = 'cca5a5a1-9e4d-6e3c-1846-d424c17c6279'
+create vertex Species set limbs = 10, name = 'Hippogriff', uuid = 'af19922a-d9b8-a714-e61a-441c12e0c8b2'
+create vertex Animal set birthday = DATE("2012-03-16 00:00:00"), color = 'green', name = 'Nazgul__0', net_worth = 442.69, uuid = '5a921187-19c7-8df4-8f4f-f31e78de5857'
+create vertex Animal set birthday = DATE("2006-09-20 00:00:00"), color = 'orange', name = 'Nazgul__1', net_worth = 62.98, uuid = '9ca5499d-004a-e545-a011-6be5ab0c1681'
+create vertex Animal set birthday = DATE("2018-11-28 00:00:00"), color = 'red', name = 'Nazgul__2', net_worth = 489.28, uuid = '8b0163c1-cd9d-2b7d-247a-8333f7b0b7d2'
+create vertex Animal set birthday = DATE("2015-07-27 00:00:00"), color = 'magenta', name = 'Nazgul__3', net_worth = 603.18, uuid = 'b4e1357d-4a84-eb03-8d1f-d9b74d2b9deb'
+create vertex Animal set birthday = DATE("2003-03-18 00:00:00"), color = 'green', name = 'Nazgul__4', net_worth = 656.65, uuid = '935ddd72-5129-fb7c-6288-e1a5cc457821'
+create vertex Animal set birthday = DATE("2017-08-27 00:00:00"), color = 'orange', name = 'Nazgul__(024)', net_worth = 579.69, uuid = 'cfc6e625-8594-0927-468f-f53d864a7a50'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(024)') to (select from Animal where name = 'Nazgul__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(024)') to (select from Animal where name = 'Nazgul__2')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(024)') to (select from Animal where name = 'Nazgul__4')
+create vertex Animal set birthday = DATE("2002-08-10 00:00:00"), color = 'green', name = 'Nazgul__(234)', net_worth = 190.37, uuid = '5b7c709a-cb17-5a5a-fb82-860deabca8d0'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(234)') to (select from Animal where name = 'Nazgul__2')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(234)') to (select from Animal where name = 'Nazgul__3')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(234)') to (select from Animal where name = 'Nazgul__4')
+create vertex Animal set birthday = DATE("2001-02-20 00:00:00"), color = 'orange', name = 'Nazgul__(013)', net_worth = 45.23, uuid = '552116dd-2ba4-b180-cb69-ca385f3f5638'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(013)') to (select from Animal where name = 'Nazgul__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(013)') to (select from Animal where name = 'Nazgul__1')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(013)') to (select from Animal where name = 'Nazgul__3')
+create vertex Animal set birthday = DATE("2007-12-02 00:00:00"), color = 'yellow', name = 'Nazgul__((234)34)', net_worth = 21.63, uuid = '9371a71f-d480-865f-9b38-fe803042e325'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((234)34)') to (select from Animal where name = 'Nazgul__(234)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((234)34)') to (select from Animal where name = 'Nazgul__3')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((234)34)') to (select from Animal where name = 'Nazgul__4')
+create vertex Animal set birthday = DATE("2005-06-02 00:00:00"), color = 'red', name = 'Nazgul__(((234)34)01)', net_worth = 467.13, uuid = '11ebcd49-428a-1c22-d5fd-b76a19fbeb1d'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(((234)34)01)') to (select from Animal where name = 'Nazgul__((234)34)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(((234)34)01)') to (select from Animal where name = 'Nazgul__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(((234)34)01)') to (select from Animal where name = 'Nazgul__1')
+create vertex Animal set birthday = DATE("2017-03-19 00:00:00"), color = 'orange', name = 'Nazgul__((024)(234)3)', net_worth = 966.54, uuid = 'bb4a06cb-e786-ab37-5bca-47be429817c5'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((024)(234)3)') to (select from Animal where name = 'Nazgul__(024)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((024)(234)3)') to (select from Animal where name = 'Nazgul__(234)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((024)(234)3)') to (select from Animal where name = 'Nazgul__3')
+create vertex Animal set birthday = DATE("2007-07-15 00:00:00"), color = 'yellow', name = 'Nazgul__((013)(234)0)', net_worth = 311.44, uuid = '2cc0f859-aa65-24ab-713b-7e05ebe21368'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((013)(234)0)') to (select from Animal where name = 'Nazgul__(013)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((013)(234)0)') to (select from Animal where name = 'Nazgul__(234)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((013)(234)0)') to (select from Animal where name = 'Nazgul__0')
+create vertex Animal set birthday = DATE("2007-08-01 00:00:00"), color = 'yellow', name = 'Nazgul__((((234)34)01)24)', net_worth = 192.3, uuid = 'b732d46f-21e1-5094-9efe-e464da90f534'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((((234)34)01)24)') to (select from Animal where name = 'Nazgul__(((234)34)01)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((((234)34)01)24)') to (select from Animal where name = 'Nazgul__2')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((((234)34)01)24)') to (select from Animal where name = 'Nazgul__4')
+create vertex Animal set birthday = DATE("2002-07-14 00:00:00"), color = 'green', name = 'Nazgul__((013)24)', net_worth = 561.4, uuid = '720299e3-2a69-acc7-0bf9-c0efb5816b74'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((013)24)') to (select from Animal where name = 'Nazgul__(013)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((013)24)') to (select from Animal where name = 'Nazgul__2')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__((013)24)') to (select from Animal where name = 'Nazgul__4')
+create vertex Animal set birthday = DATE("2018-08-03 00:00:00"), color = 'blue', name = 'Nazgul__(((013)(234)0)((024)(234)3)(024))', net_worth = 725.55, uuid = 'cffa6cdd-f963-a7ef-e001-11e5d29dc5df'
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(((013)(234)0)((024)(234)3)(024))') to (select from Animal where name = 'Nazgul__((013)(234)0)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(((013)(234)0)((024)(234)3)(024))') to (select from Animal where name = 'Nazgul__((024)(234)3)')
+create edge Animal_ParentOf from (select from Animal where name = 'Nazgul__(((013)(234)0)((024)(234)3)(024))') to (select from Animal where name = 'Nazgul__(024)')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__0') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__1') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__2') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__3') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__4') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__(024)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__(234)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__(013)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__((234)34)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__(((234)34)01)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__((024)(234)3)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__((013)(234)0)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__((((234)34)01)24)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__((013)24)') to (select from Species where name = 'Nazgul')
+create edge Animal_OfSpecies from (select from Animal where name = 'Nazgul__(((013)(234)0)((024)(234)3)(024))') to (select from Species where name = 'Nazgul')
+create vertex Animal set birthday = DATE("2000-10-15 00:00:00"), color = 'black', name = 'Pteranodon__0', net_worth = 97.78, uuid = '36a98d74-00de-59f5-50f0-fc2b6ae04d52'
+create vertex Animal set birthday = DATE("2016-05-03 00:00:00"), color = 'red', name = 'Pteranodon__1', net_worth = 274.71, uuid = 'fa7ff8bf-b044-284a-47ac-f2f64d6b234f'
+create vertex Animal set birthday = DATE("2012-07-27 00:00:00"), color = 'red', name = 'Pteranodon__2', net_worth = 938.43, uuid = '04c14982-d9ea-d926-4745-dd9e27896389'
+create vertex Animal set birthday = DATE("2017-08-11 00:00:00"), color = 'black', name = 'Pteranodon__3', net_worth = 537.92, uuid = 'a7c5cb87-9b8b-71a1-b38a-05fbf61164ce'
+create vertex Animal set birthday = DATE("2005-05-11 00:00:00"), color = 'blue', name = 'Pteranodon__4', net_worth = 93.7, uuid = '4a814d53-964d-db77-6025-f0ae35354579'
+create vertex Animal set birthday = DATE("2010-04-14 00:00:00"), color = 'yellow', name = 'Pteranodon__(034)', net_worth = 239.7, uuid = '4a1eb1b7-955d-0e77-fb5e-b8662640211e'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(034)') to (select from Animal where name = 'Pteranodon__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(034)') to (select from Animal where name = 'Pteranodon__3')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(034)') to (select from Animal where name = 'Pteranodon__4')
+create vertex Animal set birthday = DATE("2002-07-14 00:00:00"), color = 'green', name = 'Pteranodon__((034)02)', net_worth = 337.08, uuid = 'd5e73e3f-6736-17d9-4d7b-d307122411e6'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((034)02)') to (select from Animal where name = 'Pteranodon__(034)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((034)02)') to (select from Animal where name = 'Pteranodon__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((034)02)') to (select from Animal where name = 'Pteranodon__2')
+create vertex Animal set birthday = DATE("2013-11-26 00:00:00"), color = 'green', name = 'Pteranodon__((034)04)', net_worth = 626.74, uuid = '6d316b4a-7f6b-8793-b318-ad4c1db2b452'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((034)04)') to (select from Animal where name = 'Pteranodon__(034)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((034)04)') to (select from Animal where name = 'Pteranodon__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((034)04)') to (select from Animal where name = 'Pteranodon__4')
+create vertex Animal set birthday = DATE("2009-06-14 00:00:00"), color = 'yellow', name = 'Pteranodon__(((034)02)((034)04)3)', net_worth = 584.88, uuid = '0202861c-6283-0869-0fa7-ee0538974df5'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)((034)04)3)') to (select from Animal where name = 'Pteranodon__((034)02)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)((034)04)3)') to (select from Animal where name = 'Pteranodon__((034)04)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)((034)04)3)') to (select from Animal where name = 'Pteranodon__3')
+create vertex Animal set birthday = DATE("2016-09-26 00:00:00"), color = 'red', name = 'Pteranodon__(((034)02)23)', net_worth = 451.61, uuid = '5bc7fdeb-3123-4efe-6e64-80432aa50f4e'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)23)') to (select from Animal where name = 'Pteranodon__((034)02)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)23)') to (select from Animal where name = 'Pteranodon__2')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)23)') to (select from Animal where name = 'Pteranodon__3')
+create vertex Animal set birthday = DATE("2007-07-05 00:00:00"), color = 'blue', name = 'Pteranodon__(((034)02)13)', net_worth = 988.68, uuid = '25777cf0-9f98-2188-3744-da64cc249558'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)13)') to (select from Animal where name = 'Pteranodon__((034)02)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)13)') to (select from Animal where name = 'Pteranodon__1')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((034)02)13)') to (select from Animal where name = 'Pteranodon__3')
+create vertex Animal set birthday = DATE("2016-11-28 00:00:00"), color = 'black', name = 'Pteranodon__((((034)02)13)13)', net_worth = 635.06, uuid = '856f3d95-e0ae-1a1b-6c59-6216ae0fdbc8'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)13)13)') to (select from Animal where name = 'Pteranodon__(((034)02)13)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)13)13)') to (select from Animal where name = 'Pteranodon__1')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)13)13)') to (select from Animal where name = 'Pteranodon__3')
+create vertex Animal set birthday = DATE("2016-08-05 00:00:00"), color = 'magenta', name = 'Pteranodon__((((034)02)13)(((034)02)23)(034))', net_worth = 379.0, uuid = '52631db9-d170-34ce-5179-7350e6256403'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)13)(((034)02)23)(034))') to (select from Animal where name = 'Pteranodon__(((034)02)13)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)13)(((034)02)23)(034))') to (select from Animal where name = 'Pteranodon__(((034)02)23)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)13)(((034)02)23)(034))') to (select from Animal where name = 'Pteranodon__(034)')
+create vertex Animal set birthday = DATE("2014-06-25 00:00:00"), color = 'green', name = 'Pteranodon__((((034)02)((034)04)3)(034)3)', net_worth = 800.64, uuid = '21681081-399f-8a8f-10fc-9eee0a1727f7'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)((034)04)3)(034)3)') to (select from Animal where name = 'Pteranodon__(((034)02)((034)04)3)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)((034)04)3)(034)3)') to (select from Animal where name = 'Pteranodon__(034)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__((((034)02)((034)04)3)(034)3)') to (select from Animal where name = 'Pteranodon__3')
+create vertex Animal set birthday = DATE("2012-10-22 00:00:00"), color = 'magenta', name = 'Pteranodon__(((((034)02)13)(((034)02)23)(034))(034)4)', net_worth = 990.53, uuid = '809f2923-87a1-798f-e6ad-dd9e61d9fe39'
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((((034)02)13)(((034)02)23)(034))(034)4)') to (select from Animal where name = 'Pteranodon__((((034)02)13)(((034)02)23)(034))')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((((034)02)13)(((034)02)23)(034))(034)4)') to (select from Animal where name = 'Pteranodon__(034)')
+create edge Animal_ParentOf from (select from Animal where name = 'Pteranodon__(((((034)02)13)(((034)02)23)(034))(034)4)') to (select from Animal where name = 'Pteranodon__4')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__0') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__1') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__2') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__3') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__4') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__(034)') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__((034)02)') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__((034)04)') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__(((034)02)((034)04)3)') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__(((034)02)23)') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__(((034)02)13)') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__((((034)02)13)13)') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__((((034)02)13)(((034)02)23)(034))') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__((((034)02)((034)04)3)(034)3)') to (select from Species where name = 'Pteranodon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Pteranodon__(((((034)02)13)(((034)02)23)(034))(034)4)') to (select from Species where name = 'Pteranodon')
+create vertex Animal set birthday = DATE("2017-06-28 00:00:00"), color = 'green', name = 'Dragon__0', net_worth = 845.49, uuid = 'c12ea9b8-e7e1-3ed8-6d26-5dd8bf391fbb'
+create vertex Animal set birthday = DATE("2015-08-01 00:00:00"), color = 'orange', name = 'Dragon__1', net_worth = 181.96, uuid = '961d8dcf-9b80-86da-6379-4035f8e45086'
+create vertex Animal set birthday = DATE("2004-10-22 00:00:00"), color = 'yellow', name = 'Dragon__2', net_worth = 384.15, uuid = '552ae5ca-4124-405b-91fc-fe8881c16e98'
+create vertex Animal set birthday = DATE("2009-11-21 00:00:00"), color = 'yellow', name = 'Dragon__3', net_worth = 673.54, uuid = '0932f5b6-f11d-dff7-0e37-05265582a3bd'
+create vertex Animal set birthday = DATE("2008-06-03 00:00:00"), color = 'red', name = 'Dragon__4', net_worth = 778.14, uuid = '5a4f4145-fc98-c279-cf6f-111c26c06e67'
+create vertex Animal set birthday = DATE("2008-08-10 00:00:00"), color = 'magenta', name = 'Dragon__(024)', net_worth = 124.32, uuid = 'e19b5837-1c6a-4b5e-7d85-9725c707aef9'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(024)') to (select from Animal where name = 'Dragon__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(024)') to (select from Animal where name = 'Dragon__2')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(024)') to (select from Animal where name = 'Dragon__4')
+create vertex Animal set birthday = DATE("2008-10-13 00:00:00"), color = 'orange', name = 'Dragon__((024)34)', net_worth = 789.55, uuid = '306aa871-feef-71cb-c915-d113dc45488d'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((024)34)') to (select from Animal where name = 'Dragon__(024)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((024)34)') to (select from Animal where name = 'Dragon__3')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((024)34)') to (select from Animal where name = 'Dragon__4')
+create vertex Animal set birthday = DATE("2002-11-12 00:00:00"), color = 'indigo', name = 'Dragon__(((024)34)04)', net_worth = 84.03, uuid = '81d1bf06-6b8c-66f2-8611-f583b2d10e3d'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((024)34)04)') to (select from Animal where name = 'Dragon__((024)34)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((024)34)04)') to (select from Animal where name = 'Dragon__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((024)34)04)') to (select from Animal where name = 'Dragon__4')
+create vertex Animal set birthday = DATE("2016-04-08 00:00:00"), color = 'yellow', name = 'Dragon__((((024)34)04)02)', net_worth = 352.5, uuid = '6ac1ca75-afb9-18c8-6e5b-ac20725c2675'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((024)34)04)02)') to (select from Animal where name = 'Dragon__(((024)34)04)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((024)34)04)02)') to (select from Animal where name = 'Dragon__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((024)34)04)02)') to (select from Animal where name = 'Dragon__2')
+create vertex Animal set birthday = DATE("2001-11-06 00:00:00"), color = 'orange', name = 'Dragon__((024)12)', net_worth = 204.79, uuid = 'f96d4403-d48c-93f3-028d-042b2d8b5b41'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((024)12)') to (select from Animal where name = 'Dragon__(024)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((024)12)') to (select from Animal where name = 'Dragon__1')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((024)12)') to (select from Animal where name = 'Dragon__2')
+create vertex Animal set birthday = DATE("2004-02-13 00:00:00"), color = 'indigo', name = 'Dragon__(((((024)34)04)02)((024)34)0)', net_worth = 476.69, uuid = 'b080e003-5e7f-503c-4b13-47f601d6d903'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((((024)34)04)02)((024)34)0)') to (select from Animal where name = 'Dragon__((((024)34)04)02)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((((024)34)04)02)((024)34)0)') to (select from Animal where name = 'Dragon__((024)34)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((((024)34)04)02)((024)34)0)') to (select from Animal where name = 'Dragon__0')
+create vertex Animal set birthday = DATE("2017-12-23 00:00:00"), color = 'blue', name = 'Dragon__(((((024)34)04)02)23)', net_worth = 315.89, uuid = '94b28b9d-8881-9f42-1a42-b62914afe646'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((((024)34)04)02)23)') to (select from Animal where name = 'Dragon__((((024)34)04)02)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((((024)34)04)02)23)') to (select from Animal where name = 'Dragon__2')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((((024)34)04)02)23)') to (select from Animal where name = 'Dragon__3')
+create vertex Animal set birthday = DATE("2007-09-04 00:00:00"), color = 'magenta', name = 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)', net_worth = 299.38, uuid = 'dc68d4fd-0bd7-696f-a9c7-2e7b6b770df1'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)') to (select from Animal where name = 'Dragon__(((((024)34)04)02)23)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)') to (select from Animal where name = 'Dragon__((((024)34)04)02)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)') to (select from Animal where name = 'Dragon__2')
+create vertex Animal set birthday = DATE("2007-12-02 00:00:00"), color = 'yellow', name = 'Dragon__((((((024)34)04)02)23)((024)34)(024))', net_worth = 408.62, uuid = '15a5712c-5ac4-b6c7-a310-34dd4c4b91fe'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((((024)34)04)02)23)((024)34)(024))') to (select from Animal where name = 'Dragon__(((((024)34)04)02)23)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((((024)34)04)02)23)((024)34)(024))') to (select from Animal where name = 'Dragon__((024)34)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__((((((024)34)04)02)23)((024)34)(024))') to (select from Animal where name = 'Dragon__(024)')
+create vertex Animal set birthday = DATE("2003-02-04 00:00:00"), color = 'red', name = 'Dragon__(((024)12)(024)3)', net_worth = 605.54, uuid = 'f3cc9d8a-4b16-78e4-5f20-f4063438b4e4'
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((024)12)(024)3)') to (select from Animal where name = 'Dragon__((024)12)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((024)12)(024)3)') to (select from Animal where name = 'Dragon__(024)')
+create edge Animal_ParentOf from (select from Animal where name = 'Dragon__(((024)12)(024)3)') to (select from Animal where name = 'Dragon__3')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__0') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__1') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__2') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__3') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__4') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__(024)') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__((024)34)') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__(((024)34)04)') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__((((024)34)04)02)') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__((024)12)') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__(((((024)34)04)02)((024)34)0)') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__(((((024)34)04)02)23)') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__((((((024)34)04)02)23)((((024)34)04)02)2)') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__((((((024)34)04)02)23)((024)34)(024))') to (select from Species where name = 'Dragon')
+create edge Animal_OfSpecies from (select from Animal where name = 'Dragon__(((024)12)(024)3)') to (select from Species where name = 'Dragon')
+create vertex Animal set birthday = DATE("2018-05-15 00:00:00"), color = 'blue', name = 'Hippogriff__0', net_worth = 355.36, uuid = '6bf4d047-c484-1a8d-2f75-1bde66163e5b'
+create vertex Animal set birthday = DATE("2014-08-16 00:00:00"), color = 'green', name = 'Hippogriff__1', net_worth = 156.22, uuid = '01fda698-7646-57ca-9e65-736c72f774b1'
+create vertex Animal set birthday = DATE("2004-04-22 00:00:00"), color = 'red', name = 'Hippogriff__2', net_worth = 908.77, uuid = '656fa7e6-b5c0-3f6f-94e4-cc44e3fbdbda'
+create vertex Animal set birthday = DATE("2004-12-05 00:00:00"), color = 'magenta', name = 'Hippogriff__3', net_worth = 414.83, uuid = '57030ede-889c-8ae2-4e3c-0f2d4332559d'
+create vertex Animal set birthday = DATE("2012-05-22 00:00:00"), color = 'yellow', name = 'Hippogriff__4', net_worth = 788.17, uuid = '88083ebc-35d4-cd35-a08c-3a0085e74250'
+create vertex Animal set birthday = DATE("2008-07-09 00:00:00"), color = 'yellow', name = 'Hippogriff__(134)', net_worth = 632.11, uuid = '1eda4209-b270-af55-1f90-78d52835bcdb'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(134)') to (select from Animal where name = 'Hippogriff__1')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(134)') to (select from Animal where name = 'Hippogriff__3')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(134)') to (select from Animal where name = 'Hippogriff__4')
+create vertex Animal set birthday = DATE("2008-11-01 00:00:00"), color = 'red', name = 'Hippogriff__((134)14)', net_worth = 526.82, uuid = '9f032cdc-e328-66d3-0d6a-78b07eda9ab9'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)14)') to (select from Animal where name = 'Hippogriff__(134)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)14)') to (select from Animal where name = 'Hippogriff__1')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)14)') to (select from Animal where name = 'Hippogriff__4')
+create vertex Animal set birthday = DATE("2002-01-08 00:00:00"), color = 'green', name = 'Hippogriff__((134)03)', net_worth = 640.37, uuid = '65264961-ab44-14ae-ecb3-d561bdf0b015'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)03)') to (select from Animal where name = 'Hippogriff__(134)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)03)') to (select from Animal where name = 'Hippogriff__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)03)') to (select from Animal where name = 'Hippogriff__3')
+create vertex Animal set birthday = DATE("2006-03-12 00:00:00"), color = 'yellow', name = 'Hippogriff__(((134)14)02)', net_worth = 897.2, uuid = '1aff71ae-30f2-c485-49b5-64fb92a651d7'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(((134)14)02)') to (select from Animal where name = 'Hippogriff__((134)14)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(((134)14)02)') to (select from Animal where name = 'Hippogriff__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(((134)14)02)') to (select from Animal where name = 'Hippogriff__2')
+create vertex Animal set birthday = DATE("2015-06-06 00:00:00"), color = 'black', name = 'Hippogriff__((((134)14)02)34)', net_worth = 709.99, uuid = '7df0fe6b-ce8d-75f2-6d62-e40c638d521a'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((134)14)02)34)') to (select from Animal where name = 'Hippogriff__(((134)14)02)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((134)14)02)34)') to (select from Animal where name = 'Hippogriff__3')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((134)14)02)34)') to (select from Animal where name = 'Hippogriff__4')
+create vertex Animal set birthday = DATE("2009-12-27 00:00:00"), color = 'black', name = 'Hippogriff__(((((134)14)02)34)(134)0)', net_worth = 929.75, uuid = '7552c6e8-6953-a115-5a62-ddc4e2091f49'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(((((134)14)02)34)(134)0)') to (select from Animal where name = 'Hippogriff__((((134)14)02)34)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(((((134)14)02)34)(134)0)') to (select from Animal where name = 'Hippogriff__(134)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(((((134)14)02)34)(134)0)') to (select from Animal where name = 'Hippogriff__0')
+create vertex Animal set birthday = DATE("2000-05-09 00:00:00"), color = 'red', name = 'Hippogriff__((((((134)14)02)34)(134)0)(134)4)', net_worth = 7.13, uuid = '56525ce0-3725-bd0c-79c4-5c38b440ffe0'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((((134)14)02)34)(134)0)(134)4)') to (select from Animal where name = 'Hippogriff__(((((134)14)02)34)(134)0)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((((134)14)02)34)(134)0)(134)4)') to (select from Animal where name = 'Hippogriff__(134)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((((134)14)02)34)(134)0)(134)4)') to (select from Animal where name = 'Hippogriff__4')
+create vertex Animal set birthday = DATE("2006-02-25 00:00:00"), color = 'yellow', name = 'Hippogriff__(024)', net_worth = 794.79, uuid = 'ebe0572c-8ec9-ea98-6581-f9349bcfb1c4'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(024)') to (select from Animal where name = 'Hippogriff__0')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(024)') to (select from Animal where name = 'Hippogriff__2')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__(024)') to (select from Animal where name = 'Hippogriff__4')
+create vertex Animal set birthday = DATE("2016-05-24 00:00:00"), color = 'red', name = 'Hippogriff__((134)34)', net_worth = 251.27, uuid = '30ac79dd-0b5a-afef-85a1-282a0761585b'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)34)') to (select from Animal where name = 'Hippogriff__(134)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)34)') to (select from Animal where name = 'Hippogriff__3')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((134)34)') to (select from Animal where name = 'Hippogriff__4')
+create vertex Animal set birthday = DATE("2000-10-28 00:00:00"), color = 'black', name = 'Hippogriff__((((((134)14)02)34)(134)0)((134)14)3)', net_worth = 460.51, uuid = '75ff93f0-025b-7c5f-1284-b9d78d4e2753'
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((((134)14)02)34)(134)0)((134)14)3)') to (select from Animal where name = 'Hippogriff__(((((134)14)02)34)(134)0)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((((134)14)02)34)(134)0)((134)14)3)') to (select from Animal where name = 'Hippogriff__((134)14)')
+create edge Animal_ParentOf from (select from Animal where name = 'Hippogriff__((((((134)14)02)34)(134)0)((134)14)3)') to (select from Animal where name = 'Hippogriff__3')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__0') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__1') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__2') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__3') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__4') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__(134)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__((134)14)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__((134)03)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__(((134)14)02)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__((((134)14)02)34)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__(((((134)14)02)34)(134)0)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__((((((134)14)02)34)(134)0)(134)4)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__(024)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__((134)34)') to (select from Species where name = 'Hippogriff')
+create edge Animal_OfSpecies from (select from Animal where name = 'Hippogriff__((((((134)14)02)34)(134)0)((134)14)3)') to (select from Species where name = 'Hippogriff')
diff --git a/graphql_compiler/tests/test_data_tools/data_tool.py b/graphql_compiler/tests/test_data_tools/data_tool.py
new file mode 100644
index 000000000..16fbd3526
--- /dev/null
+++ b/graphql_compiler/tests/test_data_tools/data_tool.py
@@ -0,0 +1,18 @@
+# Copyright 2018-present Kensho Technologies, LLC.
+from glob import glob
+from os import path
+
+
+def generate_data(client):
+    """Create test DB from the SQL commands file."""
+    project_root = path.dirname(path.abspath(__file__))
+    sql_files = glob(path.join(project_root, 'data/*.sql'))
+    for filepath in sql_files:
+        with open(filepath) as f:
+            for command in f.readlines():
+                sanitized_command = command.strip()
+                if len(sanitized_command) == 0 or sanitized_command[0] == '#':
+                    # comment or empty line, ignore
+                    continue
+
+                client.command(sanitized_command)
diff --git a/graphql_compiler/tests/test_data_tools/graph.py b/graphql_compiler/tests/test_data_tools/graph.py
new file mode 100644
index 000000000..f6d76864f
--- /dev/null
+++ b/graphql_compiler/tests/test_data_tools/graph.py
@@ -0,0 +1,35 @@
+# Copyright 2018-present Kensho Technologies, LLC.
+from pyorient import OrientDB
+from pyorient.constants import DB_TYPE_GRAPH
+from pyorient.ogm import Config, Graph
+
+from .data_tool import generate_data
+from .schema import load_schema
+
+
+ORIENTDB_SERVER = "localhost"
+ORIENTDB_PORT = 2424
+ORIENTDB_USER = "root"
+ORIENTDB_PASSWORD = "root"
+
+
+def get_orientdb_url(database_name):
+    """Return an OrientDB path for the specified database on the ORIENTDB_SERVER."""
+    template = 'memory://{}/{}'
+    return template.format(ORIENTDB_SERVER, database_name)
+
+
+def get_test_graph(graph_name):
+    """Generate the test database and return the pyorient client."""
+    url = get_orientdb_url(graph_name)
+    config = Config.from_url(url, ORIENTDB_USER, ORIENTDB_PASSWORD, initial_drop=True)
+    Graph(config, strict=True)
+
+    client = OrientDB('localhost', ORIENTDB_PORT)
+    client.connect(ORIENTDB_USER, ORIENTDB_PASSWORD)
+    client.db_open(graph_name, ORIENTDB_USER, ORIENTDB_PASSWORD, db_type=DB_TYPE_GRAPH)
+
+    load_schema(client)
+    generate_data(client)
+
+    return client
diff --git a/graphql_compiler/tests/test_data_tools/schema.py b/graphql_compiler/tests/test_data_tools/schema.py
new file mode 100644
index 000000000..759a7183a
--- /dev/null
+++ b/graphql_compiler/tests/test_data_tools/schema.py
@@ -0,0 +1,25 @@
+# Copyright 2018-present Kensho Technologies, LLC.
+from glob import glob
+from os import path
+
+
+def load_schema(client):
+    """Read the schema file and apply the specified SQL updates to the client."""
+    project_root = path.dirname(path.dirname(path.abspath(__file__)))
+    file_path = path.join(project_root, 'test_data_tools/schema.sql')
+    sql_files = glob(file_path)
+    if len(sql_files) > 1:
+        raise AssertionError(u'Multiple schema files found. Expected single `schema.sql` '
+                             u'in graphql-compiler/graphql_compiler/tests/test_data_tools/')
+    if len(sql_files) == 0 or sql_files[0] != file_path:
+        raise AssertionError(u'Schema file not found. Expected graphql-compiler/graphql_compiler/'
+                             u'tests/test_data_tools/schema.sql')
+
+    with open(file_path, 'r') as update_file:
+        for line in update_file:
+            sanitized = line.strip()
+            if len(sanitized) == 0 or sanitized[0] == '#':
+                # comment or empty line, ignore
+                continue
+
+            client.command(sanitized)
diff --git a/graphql_compiler/tests/test_data_tools/schema.sql b/graphql_compiler/tests/test_data_tools/schema.sql
new file mode 100644
index 000000000..324f473a7
--- /dev/null
+++ b/graphql_compiler/tests/test_data_tools/schema.sql
@@ -0,0 +1,82 @@
+### UUIDs ###
+CREATE CLASS UniquelyIdentifiable
+CREATE PROPERTY UniquelyIdentifiable.uuid String
+# make uuid default to '' and insert such a record on purpose
+# this will ensure that no UniquelyIdentifiable is added without a valid uuid field
+ALTER PROPERTY UniquelyIdentifiable.uuid DEFAULT ''
+INSERT INTO UniquelyIdentifiable SET uuid = ''
+CREATE INDEX UniquelyIdentifiable.uuid UNIQUE_HASH_INDEX
+###############
+
+### Entity ###
+CREATE CLASS Entity EXTENDS V, UniquelyIdentifiable ABSTRACT
+CREATE PROPERTY Entity.name String
+CREATE INDEX Entity.name UNIQUE
+
+CREATE PROPERTY Entity.alias EmbeddedSet String
+ALTER PROPERTY Entity.alias DEFAULT {}
+CREATE INDEX Entity.alias NOTUNIQUE
+
+CREATE PROPERTY Entity.description String
+###############
+
+### Event ###
+CREATE CLASS Event EXTENDS Entity
+
+CREATE PROPERTY Event.event_date Date
+CREATE INDEX Event.event_date NOTUNIQUE
+###############
+
+### BirthEvent ###
+CREATE CLASS BirthEvent EXTENDS Event
+###############
+
+### Animal ###
+CREATE CLASS Animal EXTENDS Entity
+
+CREATE PROPERTY Animal.color String
+CREATE INDEX Animal.color NOTUNIQUE
+
+CREATE PROPERTY Animal.birthday Date
+CREATE INDEX Animal.birthday NOTUNIQUE
+
+CREATE PROPERTY Animal.net_worth Decimal
+CREATE INDEX Animal.net_worth NOTUNIQUE
+
+CREATE CLASS Animal_ParentOf EXTENDS E
+CREATE PROPERTY Animal_ParentOf.out LINK Animal
+CREATE PROPERTY Animal_ParentOf.in LINK Animal
+CREATE INDEX Animal_ParentOf ON Animal_ParentOf (in, out) UNIQUE_HASH_INDEX
+
+CREATE CLASS Animal_FedAt EXTENDS E
+CREATE PROPERTY Animal_FedAt.in LINK Event
+CREATE PROPERTY Animal_FedAt.out LINK Animal
+CREATE INDEX Animal_FedAt ON Animal_FedAt (in, out) UNIQUE_HASH_INDEX
+
+CREATE CLASS Animal_ImportantEvent EXTENDS E
+CREATE PROPERTY Animal_ImportantEvent.in LINK Event
+CREATE PROPERTY Animal_ImportantEvent.out LINK Animal
+CREATE INDEX Animal_ImportantEvent ON Animal_ImportantEvent (in, out) UNIQUE_HASH_INDEX
+
+CREATE CLASS Animal_BornAt EXTENDS E
+CREATE PROPERTY Animal_BornAt.in LINK Event
+CREATE PROPERTY Animal_BornAt.out LINK Animal
+CREATE INDEX Animal_BornAt ON Animal_BornAt (in, out) UNIQUE_HASH_INDEX
+###############
+
+### Species ###
+CREATE CLASS Species EXTENDS Entity
+
+CREATE PROPERTY Species.limbs Integer
+CREATE INDEX Species.limbs NOTUNIQUE
+
+CREATE CLASS Species_Eats EXTENDS E
+CREATE PROPERTY Species_Eats.out LINK Species
+CREATE PROPERTY Species_Eats.in LINK Species
+CREATE INDEX Species_Eats ON Species_Eats (in, out) UNIQUE_HASH_INDEX
+
+CREATE CLASS Animal_OfSpecies EXTENDS E
+CREATE PROPERTY Animal_OfSpecies.in LINK Species
+CREATE PROPERTY Animal_OfSpecies.out LINK Animal
+CREATE INDEX Animal_OfSpecies ON Animal_OfSpecies (in, out) UNIQUE_HASH_INDEX
+###############
diff --git a/graphql_compiler/tests/test_input_data.py b/graphql_compiler/tests/test_input_data.py
index 21fd4eca9..ad23b07fc 100644
--- a/graphql_compiler/tests/test_input_data.py
+++ b/graphql_compiler/tests/test_input_data.py
@@ -268,13 +268,17 @@ def filter_on_optional_variable_name_or_alias():
 def filter_in_optional_block():
     graphql_input = '''{
         Animal {
-            out_Animal_FedAt @optional {
+            name @output(out_name: "animal_name")
+            out_Animal_ParentOf @optional {
                 name @filter(op_name: "=", value: ["$name"])
+                     @output(out_name: "parent_name")
                 uuid @output(out_name: "uuid")
             }
         }
     }'''
     expected_output_metadata = {
+        'animal_name': OutputMetadata(type=GraphQLString, optional=False),
+        'parent_name': OutputMetadata(type=GraphQLString, optional=True),
         'uuid': OutputMetadata(type=GraphQLID, optional=True),
     }
     expected_input_metadata = {
diff --git a/graphql_compiler/tests/test_ir_generation.py b/graphql_compiler/tests/test_ir_generation.py
index 307d42314..3fd7ae985 100644
--- a/graphql_compiler/tests/test_ir_generation.py
+++ b/graphql_compiler/tests/test_ir_generation.py
@@ -472,13 +472,13 @@ def test_filter_in_optional_block(self):
         test_data = test_input_data.filter_in_optional_block()
 
         base_location = helpers.Location(('Animal',))
-        animal_fed_at_location = base_location.navigate_to_subpath('out_Animal_FedAt')
+        animal_parent_location = base_location.navigate_to_subpath('out_Animal_ParentOf')
         revisited_base_location = base_location.revisit()
 
         expected_blocks = [
             blocks.QueryRoot({'Animal'}),
             blocks.MarkLocation(base_location),
-            blocks.Traverse('out', 'Animal_FedAt', optional=True),
+            blocks.Traverse('out', 'Animal_ParentOf', optional=True),
             blocks.Filter(
                 expressions.BinaryComposition(
                     u'=',
@@ -486,22 +486,31 @@ def test_filter_in_optional_block(self):
                     expressions.Variable('$name', GraphQLString)
                 )
             ),
-            blocks.MarkLocation(animal_fed_at_location),
+            blocks.MarkLocation(animal_parent_location),
             blocks.EndOptional(),
             blocks.Backtrack(base_location, optional=True),
             blocks.MarkLocation(revisited_base_location),
             blocks.ConstructResult({
+                'animal_name': expressions.OutputContextField(
+                    base_location.navigate_to_field('name'), GraphQLString
+                ),
+                'parent_name': expressions.TernaryConditional(
+                    expressions.ContextFieldExistence(animal_parent_location),
+                    expressions.OutputContextField(
+                        animal_parent_location.navigate_to_field('name'), GraphQLString),
+                    expressions.NullLiteral
+                ),
                 'uuid': expressions.TernaryConditional(
-                    expressions.ContextFieldExistence(animal_fed_at_location),
+                    expressions.ContextFieldExistence(animal_parent_location),
                     expressions.OutputContextField(
-                        animal_fed_at_location.navigate_to_field('uuid'), GraphQLID),
+                        animal_parent_location.navigate_to_field('uuid'), GraphQLID),
                     expressions.NullLiteral
                 )
             }),
         ]
         expected_location_types = {
             base_location: 'Animal',
-            animal_fed_at_location: 'Event',
+            animal_parent_location: 'Animal',
             revisited_base_location: 'Animal',
         }
 
diff --git a/scripts/generate_test_sql/__init__.py b/scripts/generate_test_sql/__init__.py
new file mode 100644
index 000000000..e4ae6e7c0
--- /dev/null
+++ b/scripts/generate_test_sql/__init__.py
@@ -0,0 +1,61 @@
+# Copyright 2018-present Kensho Technologies, LLC.
+import codecs
+import datetime
+from os import path
+import random
+import re
+import sys
+
+from .animals import get_animal_generation_commands
+from .species import get_species_generation_commands
+
+
+#  https://packaging.python.org/guides/single-sourcing-package-version/
+#  #single-sourcing-the-version
+
+
+def read_file(filename):
+    """Read and return text from the file specified by `filename`, in the project root directory."""
+    # intentionally *not* adding an encoding option to open
+    # see here:
+    # https://github.com/pypa/virtualenv/issues/201#issuecomment-3145690
+    top_level_directory = path.dirname(path.dirname(path.dirname(path.abspath(__file__))))
+    with codecs.open(path.join(top_level_directory, 'graphql_compiler', filename), 'r') as f:
+        return f.read()
+
+
+def find_version():
+    """Return current version of package."""
+    version_file = read_file('__init__.py')
+    version_match = re.search(r'^__version__ = ["\']([^"\']*)["\']', version_file, re.M)
+    if version_match:
+        return version_match.group(1)
+    raise RuntimeError('Unable to find version string.')
+
+
+def main():
+    """Print a list of SQL commands to generate the testing database."""
+    random.seed(0)
+
+    module_path = path.relpath(__file__)
+    current_datetime = datetime.datetime.now().isoformat()
+
+    log_message = ('# Auto-generated output from `{path}`.\n'
+                   '# Do not edit directly!\n'
+                   '# Generated on {datetime} from compiler version {version}.\n\n')
+
+    sys.stdout.write(
+        log_message.format(path=module_path, datetime=current_datetime, version=find_version()))
+
+    sql_command_generators = [
+        get_species_generation_commands,
+        get_animal_generation_commands,
+    ]
+    for sql_command_generator in sql_command_generators:
+        sql_command_list = sql_command_generator()
+        sys.stdout.write('\n'.join(sql_command_list))
+        sys.stdout.write('\n')
+
+
+if __name__ == '__main__':
+    main()
diff --git a/scripts/generate_test_sql/animals.py b/scripts/generate_test_sql/animals.py
new file mode 100644
index 000000000..8a9807090
--- /dev/null
+++ b/scripts/generate_test_sql/animals.py
@@ -0,0 +1,100 @@
+# Copyright 2017-present Kensho Technologies, LLC.
+import random
+
+from .species import SPECIES_LIST
+from .utils import (create_edge_statement, create_name, create_vertex_statement,
+                    extract_base_name_and_label, get_random_date, get_random_net_worth, get_uuid)
+
+
+NUM_INITIAL_ANIMALS = 5
+NUM_GENERATIONS = 10
+NUM_PARENTS = 3
+ANIMAL_COLOR_LIST = (
+    'red',
+    'blue',
+    'green',
+    'yellow',
+    'magenta',
+    'black',
+    'orange',
+    'indigo',
+)
+
+
+def _create_animal_statement(animal_name):
+    """Return a SQL statement to create an animal vertex."""
+    field_name_to_value = {
+        'name': animal_name,
+        'uuid': get_uuid(),
+        'color': random.choice(ANIMAL_COLOR_LIST),  # nosec
+        'birthday': get_random_date(),
+        'net_worth': get_random_net_worth(),
+    }
+    return create_vertex_statement('Animal', field_name_to_value)
+
+
+def _create_animal_parent_of_statement(from_name, to_name):
+    """Return a SQL statement to create an Animal_ParentOf edge."""
+    return create_edge_statement('Animal_ParentOf', 'Animal', from_name, 'Animal', to_name)
+
+
+def _create_animal_of_species_statement(from_name, to_name):
+    """Return a SQL statement to create an Animal_OfSpecies edge."""
+    return create_edge_statement('Animal_OfSpecies', 'Animal', from_name, 'Species', to_name)
+
+
+def _get_initial_animal_generators(species_name, current_animal_names):
+    """Return a list of SQL statements to create initial animals for a given species."""
+    command_list = []
+    for index in range(NUM_INITIAL_ANIMALS):
+        animal_name = create_name(species_name, str(index))
+        current_animal_names.append(animal_name)
+        command_list.append(_create_animal_statement(animal_name))
+    return command_list
+
+
+def _get_new_parents(current_animal_names, previous_parent_sets, num_parents):
+    """Return a set of `num_parents` parent names that is not present in `previous_parent_sets`."""
+    while True:
+        new_parent_names = frozenset(random.sample(current_animal_names, num_parents))
+        # Duplicating a set of parents could result in Animals with the same names.
+        # This would invalidate unique selection of Animals by name.
+        if new_parent_names not in previous_parent_sets:
+            return new_parent_names
+
+
+def get_animal_generation_commands():
+    """Return a list of SQL statements to create animal vertices and their corresponding edges."""
+    command_list = []
+    species_to_names = {}
+    previous_parent_sets = set()
+
+    for species_name in SPECIES_LIST:
+        current_animal_names = []
+        species_to_names[species_name] = current_animal_names
+        command_list.extend(_get_initial_animal_generators(species_name, current_animal_names))
+
+        for _ in range(NUM_GENERATIONS):
+            new_parent_names = _get_new_parents(
+                current_animal_names, previous_parent_sets, NUM_PARENTS)
+            previous_parent_sets.add(new_parent_names)
+
+            parent_indices = sorted([
+                index
+                for _, index in [
+                    extract_base_name_and_label(parent_name)
+                    for parent_name in new_parent_names
+                ]
+            ])
+            new_label = '(' + ''.join(parent_indices) + ')'
+            new_animal_name = create_name(species_name, new_label)
+            current_animal_names.append(new_animal_name)
+            command_list.append(_create_animal_statement(new_animal_name))
+            for parent_name in sorted(new_parent_names):
+                new_edge = _create_animal_parent_of_statement(new_animal_name, parent_name)
+                command_list.append(new_edge)
+
+        for animal_name in current_animal_names:
+            command_list.append(_create_animal_of_species_statement(animal_name, species_name))
+
+    return command_list
diff --git a/scripts/generate_test_sql/species.py b/scripts/generate_test_sql/species.py
new file mode 100644
index 000000000..9d3c68704
--- /dev/null
+++ b/scripts/generate_test_sql/species.py
@@ -0,0 +1,25 @@
+# Copyright 2017-present Kensho Technologies, LLC.
+from .utils import create_vertex_statement, get_random_limbs, get_uuid
+
+
+SPECIES_LIST = (
+    'Nazgul',
+    'Pteranodon',
+    'Dragon',
+    'Hippogriff',
+)
+
+
+def _create_species_statement(species_name):
+    """Return a SQL statement to create a species vertex."""
+    field_name_to_value = {'name': species_name, 'limbs': get_random_limbs(), 'uuid': get_uuid()}
+    return create_vertex_statement('Species', field_name_to_value)
+
+
+def get_species_generation_commands():
+    """Return a list of SQL statements to create all species vertices."""
+    command_list = []
+    for species_name in SPECIES_LIST:
+        command_list.append(_create_species_statement(species_name))
+
+    return command_list
diff --git a/scripts/generate_test_sql/utils.py b/scripts/generate_test_sql/utils.py
new file mode 100644
index 000000000..cf2257ce9
--- /dev/null
+++ b/scripts/generate_test_sql/utils.py
@@ -0,0 +1,87 @@
+# Copyright 2017-present Kensho Technologies, LLC.
+import datetime
+import random
+from uuid import UUID
+
+import six
+
+
+CREATE_VERTEX = 'create vertex '
+CREATE_EDGE = 'create edge '
+SEPARATOR = '__'
+
+
+def get_uuid():
+    """Return a pseudorandom uuid."""
+    return str(UUID(int=random.randint(0, 2**128 - 1)))  # nosec
+
+
+def get_random_net_worth():
+    """Return a pseudorandom net worth."""
+    return int(1e5 * random.random()) / 100.0  # nosec
+
+
+def get_random_limbs():
+    """Return a pseudorandom number of limbs."""
+    return random.randint(2, 10)  # nosec
+
+
+def get_random_date():
+    """Return a pseudorandom date."""
+    random_year = random.randint(2000, 2018)  # nosec
+    random_month = random.randint(1, 12)  # nosec
+    random_day = random.randint(1, 28)  # nosec
+    return datetime.date(random_year, random_month, random_day)
+
+
+def select_vertex_statement(vertex_type, name):
+    """Return a SQL statement to select a vertex of given type by its `name` field."""
+    template = '(select from {vertex_type} where name = \'{name}\')'
+    args = {'vertex_type': vertex_type, 'name': name}
+    return template.format(**args)
+
+
+def set_statement(field_name, field_value):
+    """Return a SQL clause (used in creating a vertex) to set a field to a value."""
+    if not isinstance(field_name, six.string_types):
+        raise AssertionError(u'Expected string field_name. Received {}'.format(field_name))
+    field_value_representation = repr(field_value)
+    if isinstance(field_value, datetime.date):
+        field_value_representation = 'DATE("' + field_value.isoformat() + ' 00:00:00")'
+    template = '{} = {}'
+    return template.format(field_name, field_value_representation)
+
+
+def create_vertex_statement(vertex_type, field_name_to_value):
+    """Return a SQL statement to create a vertex."""
+    statement = CREATE_VERTEX + vertex_type
+    set_field_clauses = [
+        set_statement(field_name, field_name_to_value[field_name])
+        for field_name in sorted(six.iterkeys(field_name_to_value))
+    ]
+    statement += ' set ' + ', '.join(set_field_clauses)
+    return statement
+
+
+def create_edge_statement(edge_name, from_class, from_name, to_class, to_name):
+    """Return a SQL statement to create a edge."""
+    statement = CREATE_EDGE + edge_name + ' from {} to {}'
+    from_select = select_vertex_statement(from_class, from_name)
+    to_select = select_vertex_statement(to_class, to_name)
+    return statement.format(from_select, to_select)
+
+
+def create_name(base_name, label):
+    """Return a name formed by joining a base name with a label."""
+    return base_name + SEPARATOR + label
+
+
+def extract_base_name_and_label(name):
+    """Extract and return a pair of (base_name, label) from a given name field."""
+    if not isinstance(name, six.string_types):
+        raise AssertionError(u'Expected string name. Received {}'.format(name))
+    split_name = name.split(SEPARATOR)
+    if len(split_name) != 2:
+        raise AssertionError(u'Expected a sting with a single occurrence of {}. Got {}'
+                             .format(SEPARATOR, name))
+    return split_name
diff --git a/setup.py b/setup.py
index 5a057c5bb..8093afe27 100644
--- a/setup.py
+++ b/setup.py
@@ -2,8 +2,10 @@
 import codecs
 import os
 import re
+
 from setuptools import find_packages, setup
 
+
 #  https://packaging.python.org/guides/single-sourcing-package-version/
 #  #single-sourcing-the-version