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Robert Haas 131c7e70b4 postgres_fdw: Check PlaceHolderVars before pushing down a join. ... As discovered by Andreas Seltenreich via sqlsmith, it's possible for a remote join to need to generate a target list which contains a PlaceHolderVar which would need to be evaluated on the remote server. This happens when we try to push down a join tree which contains outer joins and the nullable side of the join contains a subquery which evauates some expression which can go to NULL above the level of the join. Since the deparsing logic can't build a remote query that involves subqueries, it fails while trying to produce an SQL query that can be sent to the remote side. Detect such cases and don't try to push down the join at all. It's actually fine to push down the join if the PlaceHolderVar needs to be evaluated at the current join level. This patch makes a small change to build_tlist_to_deparse so that this case will work. Amit Langote, Ashutosh Bapat, and me.		9 years ago
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postgres_fdw.sql	postgres_fdw: Check PlaceHolderVars before pushing down a join.	9 years ago