diff --git a/src/sql/engine/basic/ob_pushdown_filter.cpp b/src/sql/engine/basic/ob_pushdown_filter.cpp
index e1b15a083b..70bcf66541 100644
--- a/src/sql/engine/basic/ob_pushdown_filter.cpp
+++ b/src/sql/engine/basic/ob_pushdown_filter.cpp
@@ -169,11 +169,12 @@ int ObPushdownFilterConstructor::is_white_mode(const ObRawExpr* raw_expr, bool &
         ret = OB_ERR_UNEXPECTED;
         LOG_WARN("Unexpected null child expr", K(ret), K(i));
       } else {
+        const ObObjMeta &param_meta = child->get_result_meta();
         need_check = child->is_const_expr();
-        if (need_check) {
-          const ObObjMeta &param_meta = child->get_result_meta();
-          need_check = param_meta.is_null() ||
-            (col_meta.get_type() == param_meta.get_type() && col_meta.get_collation_type() == param_meta.get_collation_type());
+        if (need_check && !param_meta.is_null()) {
+          const ObCmpOp cmp_op = sql::ObRelationalExprOperator::get_cmp_op(raw_expr->get_expr_type());
+          obj_cmp_func cmp_func = nullptr;
+          need_check = ObObjCmpFuncs::can_cmp_without_cast(col_meta, param_meta, cmp_op, cmp_func);
         }
       }
     }
diff --git a/src/sql/engine/expr/ob_expr_operator.h b/src/sql/engine/expr/ob_expr_operator.h
index 4dbdd5ca49..e6ec41cd8c 100644
--- a/src/sql/engine/expr/ob_expr_operator.h
+++ b/src/sql/engine/expr/ob_expr_operator.h
@@ -1218,10 +1218,6 @@ public:
 
   static int eval_pl_udt_compare(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum);
 
-protected:
-  static bool is_int_cmp_const_str(const ObExprResType *type1,
-                                   const ObExprResType *type2,
-                                   common::ObObjType &cmp_type);
   OB_INLINE static common::ObCmpOp get_cmp_op(const ObExprOperatorType type) {
     /*
      * maybe we can use associative array(table lookup) to get a better
@@ -1278,6 +1274,10 @@ protected:
     return cmp_op;
   }
 
+protected:
+  static bool is_int_cmp_const_str(const ObExprResType *type1,
+                                   const ObExprResType *type2,
+                                   common::ObObjType &cmp_type);
   OB_INLINE static bool is_expected_cmp_ret(const common::ObCmpOp cmp_op,
                                             const int cmp_ret)
   {