From 3f709effe14de81b84bbc441aa5884ece0a757da Mon Sep 17 00:00:00 2001
From: Japin Li <japinli@hotmail.com>
Date: Fri, 14 Jul 2023 09:26:01 +0800
Subject: [PATCH v4 1/1] Add hint message for check_log_destination

---
 src/backend/utils/error/elog.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
index 5898100acb..dccbabf40a 100644
--- a/src/backend/utils/error/elog.c
+++ b/src/backend/utils/error/elog.c
@@ -2228,8 +2228,22 @@ check_log_destination(char **newval, void **extra, GucSource source)
 #endif
 		else
 		{
+			StringInfoData errhint;
+
+			initStringInfo(&errhint);
+			appendStringInfoString(&errhint, "stderr");
+#ifdef HAVE_SYSLOG
+			appendStringInfoString(&errhint, ", syslog");
+#endif
+#ifdef WIN32
+			appendStringInfoString(&errhint, ", eventlog");
+#endif
+			appendStringInfoString(&errhint, ", csvlog, and jsonlog");
+
 			GUC_check_errdetail("Unrecognized key word: \"%s\".", tok);
+			GUC_check_errhint("Valid values are combinations of %s.", errhint.data);
 			pfree(rawstring);
+			pfree(errhint.data);
 			list_free(elemlist);
 			return false;
 		}
-- 
2.41.0