From 81e2de2603ee6366bbb781ffef8c9d4f13e5a114 Mon Sep 17 00:00:00 2001
From: jangjangji <134360817+jangjangji@users.noreply.github.com>
Date: Fri, 7 Nov 2025 10:25:24 +0900
Subject: [PATCH] Update logfilter.py

- Add buffer.seek(0) after truncate to reset file pointer position
- Add isinstance and len check before accessing item[16] to prevent
  IndexError
- Improves robustness when processing malformed CSV log entries
---
 gpMgmt/bin/gppylib/logfilter.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gpMgmt/bin/gppylib/logfilter.py b/gpMgmt/bin/gppylib/logfilter.py
index c427ac1a6cb..411dd4f799b 100644
--- a/gpMgmt/bin/gppylib/logfilter.py
+++ b/gpMgmt/bin/gppylib/logfilter.py
@@ -278,13 +278,17 @@ def __next__(self):
         item = next(self.source)
         #we need to make a minor format change to the log level field so that
         # our single regex will match both.
-        item[16] = item[16] + ": "
+        # Check if item has enough columns before accessing index 16
+        if isinstance(item, list) and len(item) > 16:
+            item[16] = item[16] + ": "
 
         self.buffer.truncate(0)
+        self.buffer.seek(0)
         self.writer.writerow(item)
 
         return self.buffer.getvalue()
 
+
 #------------------------------- Spying --------------------------------
 
 class Count(object):