From 1287610efa3895a0ababfc66f346a6a7c7edf9b9 Mon Sep 17 00:00:00 2001 From: Maksim Milyutin Date: Fri, 11 Apr 2025 15:43:42 +0300 Subject: [PATCH v1] Simplify COALESCE with single argument --- src/backend/optimizer/util/clauses.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index 26a3e050086..60f33839214 100644 --- a/src/backend/optimizer/util/clauses.c +++ b/src/backend/optimizer/util/clauses.c @@ -3332,6 +3332,8 @@ eval_const_expressions_mutator(Node *node, return (Node *) makeNullConst(coalesceexpr->coalescetype, -1, coalesceexpr->coalescecollid); + if (list_length(newargs) == 1) + return (Node *) linitial(newargs); newcoalesce = makeNode(CoalesceExpr); newcoalesce->coalescetype = coalesceexpr->coalescetype; -- 2.43.0