From 4d54ba9b0b43207aa19da3345cf6637c980330d7 Mon Sep 17 00:00:00 2001
From: Yixin Luo <18810541851@163.com>
Date: Tue, 16 May 2023 14:11:39 +0800
Subject: [PATCH] [BugFix] fix snapshot meta upgrade compatible (#23442)

Fixes #20436

When the BE try to parse the snapshot generated by old version BE, the snapshot doesn't contain delta column in footer, so parse will fail.

Signed-off-by: luohaha <18810541851@163.com>
---
 be/src/storage/snapshot_meta.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/be/src/storage/snapshot_meta.cpp b/be/src/storage/snapshot_meta.cpp
index 30aa2b8c67acf3..43f5b276a07b6c 100644
--- a/be/src/storage/snapshot_meta.cpp
+++ b/be/src/storage/snapshot_meta.cpp
@@ -150,6 +150,10 @@ Status SnapshotMeta::_parse_delta_column_group(SnapshotMetaFooterPB& footer, Ran
         return Status::InternalError(
                 fmt::format("mismatched delta column group size and segment id size, file: {}", file->filename()));
     }
+    if (footer.dcg_offsets_size() == 0) {
+        // this snapshot meta is generated by low version BE.
+        return Status::OK();
+    }
     // Parse delta column group
     std::string buff;
     const int num_dcglists = footer.dcg_offsets_size() - 1;