From d69d01ba9d8d774487032459ebb83d2086715f01 Mon Sep 17 00:00:00 2001
From: Tom Lane
Date: Mon, 5 Dec 2022 12:36:40 -0500
Subject: Fix Memoize to work with partitionwise joining.

A couple of places weren't up to speed for this.  By sheer good
luck, we didn't fail but just selected a non-memoized join plan,
at least in the test case we have.  Nonetheless, it's a bug,
and I'm not quite sure that it couldn't have worse consequences
in other examples.  So back-patch to v14 where Memoize came in.

Richard Guo

Discussion: https://postgr.es/m/CAMbWs48GkNom272sfp0-WeD6_0HSR19BJ4H1c9ZKSfbVnJsvRg@mail.gmail.com
---
 src/include/nodes/pathnodes.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/include')

diff --git a/src/include/nodes/pathnodes.h b/src/include/nodes/pathnodes.h
index dbaa9bb54dc..12624e6adb1 100644
--- a/src/include/nodes/pathnodes.h
+++ b/src/include/nodes/pathnodes.h
@@ -1865,8 +1865,8 @@ typedef struct MemoizePath
 {
 	Path		path;
 	Path	   *subpath;		/* outerpath to cache tuples from */
-	List	   *hash_operators; /* hash operators for each key */
-	List	   *param_exprs;	/* cache keys */
+	List	   *hash_operators; /* OIDs of hash equality ops for cache keys */
+	List	   *param_exprs;	/* expressions that are cache keys */
 	bool		singlerow;		/* true if the cache entry is to be marked as
 								 * complete after caching the first record. */
 	bool		binary_mode;	/* true when cache key should be compared bit
-- 
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