Extract make_SAOP_expr() function from match_orclause_to_indexcol()

Alexander Korotkov <akorotkov@postgresql.org>

Commit: d48d2e2dc8be50d3ca13305b5699384329b15433
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2025-04-04T13:01:28Z
Releases: 18.0
Extract make_SAOP_expr() function from match_orclause_to_indexcol()

This commit extracts the code to generate ScalarArrayOpExpr on top of the list
of expressions from match_orclause_to_indexcol() into a separate function
make_SAOP_expr().  This function was extracted to be used in optimization for
conversion of 'x IN (VALUES ...)' to 'x = ANY ...'.  make_SAOP_expr() is
placed in clauses.c file as only two additional headers were needed there
compared with other places.

Discussion: https://postgr.es/m/0184212d-1248-4f1f-a42d-f5cb1c1976d2%40tantorlabs.com
Author: Alena Rybakina <a.rybakina@postgrespro.ru>
Author: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Ivan Kush <ivan.kush@tantorlabs.com>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>

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