From 0f829fa3a3e7a0ea6b2c9155784d7976339ec963 Mon Sep 17 00:00:00 2001
From: test <test>
Date: Tue, 9 Jun 2026 00:06:00 +0200
Subject: [PATCH v2 1/6] Tom's patch

---
 src/backend/optimizer/path/equivclass.c |  3 ++-
 src/backend/optimizer/path/pathkeys.c   | 15 ++++++---------
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/src/backend/optimizer/path/equivclass.c b/src/backend/optimizer/path/equivclass.c
index e3697df51a2..1ee6398087e 100644
--- a/src/backend/optimizer/path/equivclass.c
+++ b/src/backend/optimizer/path/equivclass.c
@@ -1602,7 +1602,7 @@ generate_join_implied_equalities(PlannerInfo *root,
 	while ((i = bms_next_member(matching_ecs, i)) >= 0)
 	{
 		EquivalenceClass *ec = (EquivalenceClass *) list_nth(root->eq_classes, i);
-		List	   *sublist = NIL;
+		List	   *sublist;
 
 		/* ECs containing consts do not need any further enforcement */
 		if (ec->ec_has_const)
@@ -1632,6 +1632,7 @@ generate_join_implied_equalities(PlannerInfo *root,
 															  inner_rel);
 
 		result = list_concat(result, sublist);
+		list_free(sublist);
 	}
 
 	return result;
diff --git a/src/backend/optimizer/path/pathkeys.c b/src/backend/optimizer/path/pathkeys.c
index 5eb71635d15..978ac1240d7 100644
--- a/src/backend/optimizer/path/pathkeys.c
+++ b/src/backend/optimizer/path/pathkeys.c
@@ -1560,7 +1560,7 @@ find_mergeclauses_for_outer_pathkeys(PlannerInfo *root,
 	{
 		PathKey    *pathkey = (PathKey *) lfirst(i);
 		EquivalenceClass *pathkey_ec = pathkey->pk_eclass;
-		List	   *matched_restrictinfos = NIL;
+		bool		found_clauses = false;
 		ListCell   *j;
 
 		/*----------
@@ -1608,7 +1608,10 @@ find_mergeclauses_for_outer_pathkeys(PlannerInfo *root,
 			clause_ec = rinfo->outer_is_left ?
 				rinfo->left_ec : rinfo->right_ec;
 			if (clause_ec == pathkey_ec)
-				matched_restrictinfos = lappend(matched_restrictinfos, rinfo);
+			{
+				mergeclauses = lappend(mergeclauses, rinfo);
+				found_clauses = true;
+			}
 		}
 
 		/*
@@ -1616,14 +1619,8 @@ find_mergeclauses_for_outer_pathkeys(PlannerInfo *root,
 		 * sort-key positions in the pathkeys are useless.  (But we can still
 		 * mergejoin if we found at least one mergeclause.)
 		 */
-		if (matched_restrictinfos == NIL)
+		if (!found_clauses)
 			break;
-
-		/*
-		 * If we did find usable mergeclause(s) for this sort-key position,
-		 * add them to result list.
-		 */
-		mergeclauses = list_concat(mergeclauses, matched_restrictinfos);
 	}
 
 	return mergeclauses;
-- 
2.54.0