Add index on the query table on the result key column

superset/migrations/versions/f18570e03440_add_query_result_key_index.py

@@ -0,0 +1,20 @@
+"""Add index on the result key to the query table.
+
+Revision ID: f18570e03440
+Revises: 1296d28ec131
+Create Date: 2017-01-24 12:40:42.494787
+
+"""
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = 'f18570e03440'
+down_revision = '1296d28ec131'
+
+
+def upgrade():
+    op.create_index(op.f('ix_query_results_key'), 'query', ['results_key'], unique=False)
+
+
+def downgrade():
+    op.drop_index(op.f('ix_query_results_key'), table_name='query')

superset/models.py

@@ -2650,7 +2650,7 @@ class Query(Model):
     rows = Column(Integer)
     error_message = Column(Text)
     # key used to store the results in the results backend
-    results_key = Column(String(64))
+    results_key = Column(String(64), index=True)
 
     # Using Numeric in place of DateTime for sub-second precision
     # stored as seconds since epoch, allowing for milliseconds