Hi,
I updated sqlalchemy from 0.7.8 to 0.8.2 and one of my queries started
failing. I had a CTE expression with capital letters in it's name, and in
0.8 it wasn't getting consistently quoted, but it worked in 0.7.
I narrowed it down, and it only seems to happen in a query containing
multiple subqueries referring to the same CTE.
Here's an example that reproduces it. If I remove the second subquery from
this example, there's no issues:
import sys
import sqlalchemy as sa
import sqlalchemy.orm
import psycopg2
engine = sa.create_engine('postgresql://', creator=lambda:
psycopg2.connect(dbname=sys.argv[1]), echo=True)
Session = sa.orm.scoped_session(sa.orm.sessionmaker(bind=engine))
session = Session()
cte = session.query(sa.literal(1).label("id")).cte(name='CTE')
firstSubquery = session.query(cte.c.id).subquery()
secondSubquery = session.query(cte.c.id).subquery()
query = session.query(firstSubquery, secondSubquery)
print query.all()
The resulting query looks like this. Note that the last reference to "CTE"
is not quoted like the others, causing a ProgrammingError when it can't be
found.
WITH "CTE" AS
(SELECT :param_1 AS id)
SELECT anon_1.id AS anon_1_id, anon_2.id AS anon_2_id
FROM (SELECT "CTE".id AS id
FROM "CTE") AS anon_1, (SELECT "CTE".id AS id
FROM CTE) AS anon_2
Thanks,
Jesse
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