ce4f46fdc8
We were setting MERGE source subplan's targetlist by expanding the individual attributes of the source relation completely, early in the parse analysis phase. This failed to work when the condition of an action included a whole-row reference, causing setrefs.c to error out with ERROR: variable not found in subplan target lists because at that point there is nothing to resolve the whole-row reference with. We can fix this by having preprocess_targetlist expand the source targetlist for Vars required from the source rel by all actions. Moreover, by using this expansion mechanism we can do away with the targetlist expansion in transformMergeStmt, which is good because then we no longer pull in columns that aren't needed for anything. Add a test case for the problem. While at it, remove some redundant code in preprocess_targetlist(): MERGE was doing separately what is already being done for UPDATE/DELETE, so we can just rely on the latter and remove the former. (The handling of inherited rels was different for MERGE, but that was a no-longer- necessary hack.) Fix outdated, related comments for fix_join_expr also. Author: Richard Guo <guofenglinux@gmail.com> Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Reported-by: Joe Wildish <joe@lateraljoin.com> Discussion: https://postgr.es/m/fab3b90a-914d-46a9-beb0-df011ee39ee5@www.fastmail.com
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