[fix](schema-change): prevent coredump when reading non-overlapping segments from a single rowset during heavy schema change

Author: Hastyshell

be/src/olap/schema_change.cpp

@@ -552,7 +552,7 @@ Status VSchemaChangeDirectly::_inner_process(RowsetReaderSharedPtr rowset_reader
     bool eof = false;
     do {
         auto new_block = vectorized::Block::create_unique(new_tablet_schema->create_block());
-        auto ref_block = vectorized::Block::create_unique(base_tablet_schema->create_block());
+        auto ref_block = vectorized::Block::create_unique(base_tablet_schema->create_block(false));
 
         auto st = rowset_reader->next_block(ref_block.get());
         if (!st) {
@@ -621,7 +621,7 @@ Status VBaseSchemaChangeWithSorting::_inner_process(RowsetReaderSharedPtr rowset
 
     bool eof = false;
     do {
-        auto ref_block = vectorized::Block::create_unique(base_tablet_schema->create_block());
+        auto ref_block = vectorized::Block::create_unique(base_tablet_schema->create_block(false));
         auto st = rowset_reader->next_block(ref_block.get());
         if (!st) {
             if (st.is<ErrorCode::END_OF_FILE>()) {