From 0ed6fd76935293b13647a5bd59aff23e9b1029f5 Mon Sep 17 00:00:00 2001
From: Teodor Sigaev <teodor@sigaev.ru>
Date: Thu, 14 Feb 2019 15:45:55 +0300
Subject: [PATCH] fix support of predefined GUC variables (in postgresql.conf)

---
 plantuner.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/plantuner.c b/plantuner.c
index 5a1d480..050e3b7 100644
--- a/plantuner.c
+++ b/plantuner.c
@@ -30,6 +30,7 @@
 #include <postgres.h>
 
 #include <fmgr.h>
+#include <miscadmin.h>
 #include <access/heapam.h>
 #include <catalog/namespace.h>
 #include <catalog/pg_class.h>
@@ -58,6 +59,8 @@ static char *enableIndexesOutStr = "";
 get_relation_info_hook_type	prevHook = NULL;
 static bool	fix_empty_table = false;
 
+static bool	plantuner_enable_inited = false;
+static bool	plantuner_disable_inited = false;
 
 static const char *
 indexesAssign(const char * newval, bool doit, GucSource source, bool isDisable)
@@ -83,6 +86,19 @@ indexesAssign(const char * newval, bool doit, GucSource source, bool isDisable)
 				 (int)(sizeof(Oid) * (nOids+1)));
 	}
 
+	/*
+	 * follow work could be done only in normal processing because of
+	 * accsess to system catalog
+	 */
+	if (MyBackendId == InvalidBackendId || !IsUnderPostmaster ||
+		!IsNormalProcessingMode() || MyAuxProcType != NotAnAuxProcess)
+		return newval;
+
+	if (isDisable)
+		plantuner_disable_inited = true;
+	else
+		plantuner_enable_inited = true;
+
 	foreach(l, namelist)
 	{
 		char	*curname = (char *) lfirst(l);
@@ -161,6 +177,15 @@ assignEnabledIndexes(const char * newval, bool doit, GucSource source)
 	return indexesAssign(newval, doit, source, false);
 }
 
+static void
+lateInit()
+{
+	if (!plantuner_enable_inited)
+		indexesAssign(enableIndexesOutStr, true, PGC_S_USER, false);
+	if (!plantuner_disable_inited)
+		indexesAssign(disableIndexesOutStr, true, PGC_S_USER, true);
+}
+
 #if PG_VERSION_NUM >= 90100
 
 static bool
@@ -215,6 +240,8 @@ indexFilter(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 {
 	int i;
 
+	lateInit();
+
 	for(i=0;i<nDisabledIndexes;i++)
 	{
 		ListCell   *l;
@@ -277,6 +304,8 @@ IndexFilterShow(Oid* indexes, int nIndexes)
 	int		i,
 			len;
 
+	lateInit();
+
 	len = 1 /* \0 */ + nIndexes * (2 * NAMEDATALEN + 2 /* ', ' */ + 1 /* . */);
 	ptr = val = palloc(len);
 
-- 
2.37.3