diff --git a/src/sql/engine/expr/ob_expr_column_conv.cpp b/src/sql/engine/expr/ob_expr_column_conv.cpp
index e8360744d1..61b5f83e56 100644
--- a/src/sql/engine/expr/ob_expr_column_conv.cpp
+++ b/src/sql/engine/expr/ob_expr_column_conv.cpp
@@ -20,6 +20,7 @@
 #include "sql/engine/ob_exec_context.h"
 #include "sql/engine/expr/ob_expr_lob_utils.h"
 #include "lib/geo/ob_geo_utils.h"
+#include "sql/resolver/expr/ob_raw_expr_util.h"
 
 using namespace oceanbase::common;
 
@@ -239,7 +240,9 @@ int ObExprColumnConv::calc_result_typeN(ObExprResType &type,
   } else {
     type.set_type(types[0].get_type());
     type.set_collation_type(types[1].get_collation_type());
-    type.set_collation_level(common::CS_LEVEL_IMPLICIT);
+    // set collation level
+    ObCollationLevel coll_level = ObRawExprUtils::get_column_collation_level(types[0].get_type());
+    type.set_collation_level(coll_level);
     type.set_accuracy(types[2].get_accuracy());
     if (type.get_type() == ObUserDefinedSQLType) {
       type.set_subschema_id(types[2].get_accuracy().get_accuracy());
diff --git a/src/sql/resolver/expr/ob_raw_expr_util.cpp b/src/sql/resolver/expr/ob_raw_expr_util.cpp
index f2d8fdc758..1ac606d32a 100644
--- a/src/sql/resolver/expr/ob_raw_expr_util.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr_util.cpp
@@ -6208,6 +6208,19 @@ bool ObRawExprUtils::is_same_column_ref(const ObRawExpr *column_ref1, const ObRa
   return bret;
 }
 
+
+ObCollationLevel ObRawExprUtils::get_column_collation_level(const common::ObObjType &type)
+{
+  if (ob_is_string_type(type)
+      || ob_is_enumset_tc(type)
+      || ob_is_json_tc(type)
+      || ob_is_geometry_tc(type)) {
+    return CS_LEVEL_IMPLICIT;
+  } else {
+    return CS_LEVEL_NUMERIC;
+  }
+}
+
 int ObRawExprUtils::init_column_expr(const ObColumnSchemaV2 &column_schema, ObColumnRefRawExpr &column_expr)
 {
   int ret = OB_SUCCESS;
@@ -6228,11 +6241,11 @@ int ObRawExprUtils::init_column_expr(const ObColumnSchemaV2 &column_schema, ObCo
       || ob_is_json_tc(column_schema.get_data_type())
       || ob_is_geometry_tc(column_schema.get_data_type())) {
     column_expr.set_collation_type(column_schema.get_collation_type());
-    column_expr.set_collation_level(CS_LEVEL_IMPLICIT);
   } else {
     column_expr.set_collation_type(CS_TYPE_BINARY);
-    column_expr.set_collation_level(CS_LEVEL_NUMERIC);
   }
+  // extract set collation level for reuse
+  column_expr.set_collation_level(get_column_collation_level(column_schema.get_data_type()));
 
   if (OB_SUCC(ret)) {
     column_expr.set_accuracy(accuracy);
diff --git a/src/sql/resolver/expr/ob_raw_expr_util.h b/src/sql/resolver/expr/ob_raw_expr_util.h
index d20ed95964..89eb88e864 100644
--- a/src/sql/resolver/expr/ob_raw_expr_util.h
+++ b/src/sql/resolver/expr/ob_raw_expr_util.h
@@ -798,6 +798,7 @@ public:
                                     int64_t project_index,
                                     ObAliasRefRawExpr *&alias_expr);
   static int init_column_expr(const share::schema::ObColumnSchemaV2 &column_schema, ObColumnRefRawExpr &column_expr);
+  static ObCollationLevel get_column_collation_level(const common::ObObjType &type);
   /* 计算基本列的flag */
   static uint32_t calc_column_result_flag(const share::schema::ObColumnSchemaV2 &column_schema);
   static int expr_is_order_consistent(const ObRawExpr *from, const ObRawExpr *to, bool &is_consistent);