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Tom Lane 9e7e29c75a Fix planner problems with LATERAL references in PlaceHolderVars. ... The planner largely failed to consider the possibility that a PlaceHolderVar's expression might contain a lateral reference to a Var coming from somewhere outside the PHV's syntactic scope. We had a previous report of a problem in this area, which I tried to fix in a quick-hack way in commit 4da6439bd8, but Antonin Houska pointed out that there were still some problems, and investigation turned up other issues. This patch largely reverts that commit in favor of a more thoroughly thought-through solution. The new theory is that a PHV's ph_eval_at level cannot be higher than its original syntactic level. If it contains lateral references, those don't change the ph_eval_at level, but rather they create a lateral-reference requirement for the ph_eval_at join relation. The code in joinpath.c needs to handle that. Another issue is that createplan.c wasn't handling nested PlaceHolderVars properly. In passing, push knowledge of lateral-reference checks for join clauses into join_clause_is_movable_to. This is mainly so that FDWs don't need to deal with it. This patch doesn't fix the original join-qual-placement problem reported by Jeremy Evans (and indeed, one of the new regression test cases shows the wrong answer because of that). But the PlaceHolderVar problems need to be fixed before that issue can be addressed, so committing this separately seems reasonable.		12 years ago
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expected	Improve updatability checking for views and foreign tables.	12 years ago
sql	Improve updatability checking for views and foreign tables.	12 years ago
.gitignore	Add postgres_fdw contrib module.	13 years ago
Makefile	Add postgres_fdw contrib module.	13 years ago
connection.c	pgindent run for release 9.3	12 years ago
deparse.c	Avoid retrieving dummy NULL columns in postgres_fdw.	13 years ago
option.c	Improve updatability checking for views and foreign tables.	12 years ago
postgres_fdw--1.0.sql	Add postgres_fdw contrib module.	13 years ago
postgres_fdw.c	Fix planner problems with LATERAL references in PlaceHolderVars.	12 years ago
postgres_fdw.control	Add postgres_fdw contrib module.	13 years ago
postgres_fdw.h	pgindent run for release 9.3	12 years ago