From 083008c21ebab3833315179cc6045f0dae862999 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Mon, 22 Jan 2024 23:55:30 -0800
Subject: [PATCH] Added validation for GUC parameters

---
 CHANGELOG.md  | 1 +
 src/hnsw.c    | 6 ++++++
 src/ivfflat.c | 6 ++++++
 3 files changed, 13 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d5ad068..4e9ccd0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 - Improved performance of HNSW
 - Added support for parallel index builds for HNSW
+- Added validation for GUC parameters
 - Reduced memory usage for HNSW index builds
 - Reduced WAL generation for HNSW index builds
 - Fixed error with logical replication
diff --git a/src/hnsw.c b/src/hnsw.c
index 84df1d2..f5e1247 100644
--- a/src/hnsw.c
+++ b/src/hnsw.c
@@ -10,6 +10,10 @@
 #include "utils/guc.h"
 #include "utils/selfuncs.h"
 
+#if PG_VERSION_NUM < 150000
+#define MarkGUCPrefixReserved(x) EmitWarningsOnPlaceholders(x)
+#endif
+
 int			hnsw_ef_search;
 int			hnsw_lock_tranche_id;
 static relopt_kind hnsw_relopt_kind;
@@ -67,6 +71,8 @@ HnswInit(void)
 	DefineCustomIntVariable("hnsw.ef_search", "Sets the size of the dynamic candidate list for search",
 							"Valid range is 1..1000.", &hnsw_ef_search,
 							HNSW_DEFAULT_EF_SEARCH, HNSW_MIN_EF_SEARCH, HNSW_MAX_EF_SEARCH, PGC_USERSET, 0, NULL, NULL, NULL);
+
+	MarkGUCPrefixReserved("hnsw");
 }
 
 /*
diff --git a/src/ivfflat.c b/src/ivfflat.c
index f1f53ea..7545571 100644
--- a/src/ivfflat.c
+++ b/src/ivfflat.c
@@ -10,6 +10,10 @@
 #include "utils/selfuncs.h"
 #include "utils/spccache.h"
 
+#if PG_VERSION_NUM < 150000
+#define MarkGUCPrefixReserved(x) EmitWarningsOnPlaceholders(x)
+#endif
+
 int			ivfflat_probes;
 static relopt_kind ivfflat_relopt_kind;
 
@@ -30,6 +34,8 @@ IvfflatInit(void)
 	DefineCustomIntVariable("ivfflat.probes", "Sets the number of probes",
 							"Valid range is 1..lists.", &ivfflat_probes,
 							IVFFLAT_DEFAULT_PROBES, IVFFLAT_MIN_LISTS, IVFFLAT_MAX_LISTS, PGC_USERSET, 0, NULL, NULL, NULL);
+
+	MarkGUCPrefixReserved("ivfflat");
 }
 
 /*