diff --git a/be/src/vec/exec/format/orc/vorc_reader.cpp b/be/src/vec/exec/format/orc/vorc_reader.cpp
index 891ec81e992fef..293e6e9b98f9db 100644
--- a/be/src/vec/exec/format/orc/vorc_reader.cpp
+++ b/be/src/vec/exec/format/orc/vorc_reader.cpp
@@ -403,9 +403,9 @@ void OrcReader::_init_orc_cols(const orc::Type& type, std::vector<std::string>&
         if (hive1_orc) {
             hive1_orc = _is_hive1_col_name(filed_name_lower_case);
         }
-        auto filed_name_lower_case_copy = filed_name_lower_case;
         orc_cols_lower_case.emplace_back(std::move(filed_name_lower_case));
-        type_map.emplace(std::move(filed_name_lower_case_copy), type.getSubtype(i));
+        auto file_name = type.getFieldName(i);
+        type_map.emplace(std::move(file_name), type.getSubtype(i));
         if (_is_acid) {
             const orc::Type* sub_type = type.getSubtype(i);
             if (sub_type->getKind() == orc::TypeKind::STRUCT) {
diff --git a/be/src/vec/exec/format/orc/vorc_reader.h b/be/src/vec/exec/format/orc/vorc_reader.h
index dc9d565e8031c3..0f09d4e7e28837 100644
--- a/be/src/vec/exec/format/orc/vorc_reader.h
+++ b/be/src/vec/exec/format/orc/vorc_reader.h
@@ -576,7 +576,9 @@ class OrcReader : public GenericReader {
     // 2. If true, use indexes instead of column names when reading orc tables.
     bool _is_hive1_orc_or_use_idx = false;
 
+    // map col name in metastore to col name in orc file
     std::unordered_map<std::string, std::string> _col_name_to_file_col_name;
+    // map col name in orc file to orc type
     std::unordered_map<std::string, const orc::Type*> _type_map;
     std::vector<const orc::Type*> _col_orc_type;
     std::unique_ptr<ORCFileInputStream> _file_input_stream;