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Expand virtual generated columns in constraint expressions

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Virtual generated columns in constraint expressions need to be
expanded because the optimizer matches these expressions to qual
clauses.  Failing to do so can cause us to miss opportunities for
constraint exclusion.

Author: Richard Guo <guofenglinux@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/204804c0-798f-4c72-bd1f-36116024fda3%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2025-09-15 16:27:50 +02:00
parent 9ec0b29976
commit ce71993ae4
3 changed files with 47 additions and 0 deletions
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9
src/backend/optimizer/util/plancat.c
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@@ -42,6 +42,7 @@
#include "parser/parse_relation.h"
#include "parser/parsetree.h"
#include "partitioning/partdesc.h"
#include "rewrite/rewriteHandler.h"
#include "rewrite/rewriteManip.h"
#include "statistics/statistics.h"
#include "storage/bufmgr.h"
@@ -1482,6 +1483,14 @@ get_relation_constraints(PlannerInfo *root,
result = list_concat(result, rel->partition_qual);
}
/*
* Expand virtual generated columns in the constraint expressions.
*/
if (result)
result = (List *) expand_generated_columns_in_expr((Node *) result,
relation,
varno);
table_close(relation, NoLock);
return result;