Resolving subqueries columns

[collerek]

Final piece of work in regard of resolving aliases and columns coming from sub-queries to the actual database columns.
Now all aliases should resolve and only real columns should be included in columns and columns_dict.

Following the updated readme note the tables in join:

from sql_metadata import Parser

parser = Parser(
"""
SELECT COUNT(1) FROM
(SELECT std.task_id FROM some_task_detail std WHERE std.STATUS = 1) a
JOIN (SELECT st.task_id FROM some_task st WHERE task_type_id = 80) b
ON a.task_id = b.task_id;
"""
)

# get sub-queries dictionary
parser.subqueries
# {"a": "SELECT std.task_id FROM some_task_detail std WHERE std.STATUS = 1",
#  "b": "SELECT st.task_id FROM some_task st WHERE task_type_id = 80"}


# get names/ aliases of sub-queries / derived tables
parser.subqueries_names
# ["a", "b"]

# note that columns coming from sub-queries are resolved to real columns
parser.columns
#["some_task_detail.task_id", "some_task_detail.STATUS", "some_task.task_id", 
# "task_type_id"]

# same applies for columns_dict, note the join columns are resolved
parser.columns_dict
#{'join': ['some_task_detail.task_id', 'some_task.task_id'],
# 'select': ['some_task_detail.task_id', 'some_task.task_id'],
# 'where': ['some_task_detail.STATUS', 'task_type_id']}

Let me know what you think :)

[macbre]

👌🏻

[macbre]

👌🏻

[collerek]

I realized that I forgot about with queries -> so that's also something that needs to be developed later (resolving with queries).

[macbre]

👌🏻

[collerek]

@macbre - now after coverage add the test pipeline fails with lack of GITHUB_TOKEN

[collerek]

@macbre - Ok I fixed the coverall runs, do you need me to do anything more for this PR?