0003-gen_guc_tables-report-duplicate-entry-names-distinct.patch

From 163c196f4043b97a27ff79b7d77cc9954f35a63c Mon Sep 17 00:00:00 2001
From: Zsolt Parragi <zsolt.parragi@percona.com>
Date: Sun, 15 Mar 2026 11:22:15 +0000
Subject: [PATCH 3/4] gen_guc_tables: report duplicate entry names distinctly

The existing alphabetical-order check catches duplicates, but reports
them as "not in alphabetical order" which is confusing.  Split the
check to give a clear "duplicate entry" message, and also include the
file name and line number in the ordering error.
---
 src/backend/utils/misc/gen_guc_tables.pl | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/backend/utils/misc/gen_guc_tables.pl b/src/backend/utils/misc/gen_guc_tables.pl
index b1c1b7afc6c..9b6e3ed6622 100644
--- a/src/backend/utils/misc/gen_guc_tables.pl
+++ b/src/backend/utils/misc/gen_guc_tables.pl
@@ -133,10 +133,17 @@ sub print_table
 	{
 		validate_guc_entry($entry);
 
-		if (defined($prev_name) && lc($prev_name) ge lc($entry->{name}))
+		if (defined($prev_name) && lc($prev_name) eq lc($entry->{name}))
 		{
 			die sprintf(
-				"entries are not in alphabetical order: \"%s\", \"%s\"\n",
+				qq{%s:%d: error: duplicate entry "%s"\n},
+				$input_fname, $entry->{line_number}, $entry->{name});
+		}
+		if (defined($prev_name) && lc($prev_name) gt lc($entry->{name}))
+		{
+			die sprintf(
+				qq{%s:%d: error: entries are not in alphabetical order: "%s", "%s"\n},
+				$input_fname, $entry->{line_number},
 				$prev_name, $entry->{name});
 		}
 
-- 
2.43.0