diff --git a/be/src/olap/rowset/segment_v2/segment.cpp b/be/src/olap/rowset/segment_v2/segment.cpp
index 90a8f9b447efcf..b56d607c855edd 100644
--- a/be/src/olap/rowset/segment_v2/segment.cpp
+++ b/be/src/olap/rowset/segment_v2/segment.cpp
@@ -229,6 +229,8 @@ Status Segment::load_index() {
 }
 
 Status Segment::_create_column_readers() {
+    std::unordered_map<uint32_t, uint32_t> _column_id_to_footer_ordinal;
+
     for (uint32_t ordinal = 0; ordinal < _footer.columns().size(); ++ordinal) {
         auto& column_pb = _footer.columns(ordinal);
         _column_id_to_footer_ordinal.emplace(column_pb.unique_id(), ordinal);
diff --git a/be/src/olap/rowset/segment_v2/segment.h b/be/src/olap/rowset/segment_v2/segment.h
index 461c3ba94516c1..00d3b906bb5f12 100644
--- a/be/src/olap/rowset/segment_v2/segment.h
+++ b/be/src/olap/rowset/segment_v2/segment.h
@@ -133,11 +133,6 @@ class Segment : public std::enable_shared_from_this<Segment> {
     int64_t _meta_mem_usage;
     SegmentFooterPB _footer;
 
-    // Map from column unique id to column ordinal in footer's ColumnMetaPB
-    // If we can't find unique id from it, it means this segment is created
-    // with an old schema.
-    std::unordered_map<uint32_t, uint32_t> _column_id_to_footer_ordinal;
-
     // map column unique id ---> column reader
     // ColumnReader for each column in TabletSchema. If ColumnReader is nullptr,
     // This means that this segment has no data for that column, which may be added