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Support PlaceHolderVars in MERGE actions.

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preprocess_targetlist thought PHVs couldn't appear here.
It was mistaken, as per report from Önder Kalacı.

Surveying other pull_var_clause calls, I noted no similar errors,
but I did notice that qual_is_pushdown_safe's assertion about
!contain_window_function was pointless, because the following
pull_var_clause call would complain about them anyway.  In HEAD
only, remove the redundant Assert and improve the commentary.

Discussion: https://postgr.es/m/CACawEhUuum-gC_2S3sXLTcsk7bUSPSHOD+g1ZpfKaDK-KKPPWA@mail.gmail.com
This commit is contained in:
Tom Lane
2023-03-15 11:59:18 -04:00
parent 69b6032e0d
commit 3908d6ae11
3 changed files with 36 additions and 7 deletions
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12
src/backend/optimizer/prep/preptlist.c
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@@ -155,17 +155,15 @@ preprocess_targetlist(PlannerInfo *root)
extract_update_targetlist_colnos(action->targetList);
/*
* Add resjunk entries for any Vars used in each action's
* targetlist and WHEN condition that belong to relations other
* than target. Note that aggregates, window functions and
* placeholder vars are not possible anywhere in MERGE's WHEN
* clauses. (PHVs may be added later, but they don't concern us
* here.)
* Add resjunk entries for any Vars and PlaceHolderVars used in
* each action's targetlist and WHEN condition that belong to
* relations other than the target. We don't expect to see any
* aggregates or window functions here.
*/
vars = pull_var_clause((Node *)
list_concat_copy((List *) action->qual,
action->targetList),
0);
PVC_INCLUDE_PLACEHOLDERS);
foreach(l2, vars)
{
Var *var = (Var *) lfirst(l2);