From 7b2fdd26a19e90fb29cd02c56679dcf5a73ed2ed Mon Sep 17 00:00:00 2001
From: TengJianPing <18241664+jacktengg@users.noreply.github.com>
Date: Sun, 9 Oct 2022 19:44:00 +0800
Subject: [PATCH] [schema change](fix) fix coredump of schema change (#13183)

When schema change and compaction is executing simutaneously, both
nullable and not nullable data can be read for the same column, need to
reset _nullmap for each Block when converting Block data, or else Column
case will be wrong.
---
 be/src/vec/olap/olap_data_convertor.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/be/src/vec/olap/olap_data_convertor.cpp b/be/src/vec/olap/olap_data_convertor.cpp
index 58ab5d6579..33598c4e98 100644
--- a/be/src/vec/olap/olap_data_convertor.cpp
+++ b/be/src/vec/olap/olap_data_convertor.cpp
@@ -160,6 +160,7 @@ void OlapBlockDataConvertor::OlapColumnDataConvertorBase::set_source_column(
 void OlapBlockDataConvertor::OlapColumnDataConvertorBase::clear_source_column() {
     // just to reduce the source column's ref count to 1
     _typed_column.column = nullptr;
+    _nullmap = nullptr;
 }
 
 // This should be called only in SegmentWriter. If you want to access nullmap in Convertor,