commit 12d2a8cd596d63dd908149b9140f527b723585cc
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date:   Sat Jan 10 18:28:39 2026 -0500

    Make SysCacheIdentifier be ABI.

diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index f7f4f56a4d2..1af3ab3afdf 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -671,6 +671,14 @@ GetSysCacheHashValue(int cacheId,
 	return GetCatCacheHashValue(SysCache[cacheId], key1, key2, key3, key4);
 }
 
+/*
+ * Dummy function with an "enum SysCacheIdentifier" parameter.
+ */
+void
+SysCacheDummy(enum SysCacheIdentifier cacheId)
+{
+}
+
 /*
  * List-search interface
  */
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index b541911c8fc..052c4550d22 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -72,6 +72,8 @@ extern Datum SysCacheGetAttrNotNull(int cacheId, HeapTuple tup,
 extern uint32 GetSysCacheHashValue(int cacheId,
 								   Datum key1, Datum key2, Datum key3, Datum key4);
 
+extern void SysCacheDummy(enum SysCacheIdentifier cacheId);
+
 /* list-search interface.  Users of this must import catcache.h too */
 struct catclist;
 extern struct catclist *SearchSysCacheList(int cacheId, int nkeys,