diff --git a/src/sql/resolver/expr/ob_raw_expr_type_demotion.cpp b/src/sql/resolver/expr/ob_raw_expr_type_demotion.cpp
index 2ff75d77f8..7e4e4d7fad 100644
--- a/src/sql/resolver/expr/ob_raw_expr_type_demotion.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr_type_demotion.cpp
@@ -434,9 +434,8 @@ int ObRawExprTypeDemotion::demote_type_in_or_not_in(ObOpRawExpr &expr)
              OB_ISNULL(right = expr.get_param_expr(1))) {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("param expr is null", K(ret), KP(left), KP(right));
-  } else if (T_OP_ROW != right->get_expr_type()
-      || !op_row_params_is_all_const(*static_cast<const ObOpRawExpr*>(right))) {
-    // if in list is not op_row and params is not all const expr, skip type demotion
+  } else if (T_OP_ROW != right->get_expr_type()) {
+    // if in list is not op_row, skip type demotion
   } else if (T_REF_COLUMN == left->get_expr_type()) {
     // col in (a, b, c)
     const ObColumnRefRawExpr *column_ref = static_cast<const ObColumnRefRawExpr*>(left);
@@ -495,24 +494,6 @@ int ObRawExprTypeDemotion::demote_type_in_or_not_in(ObOpRawExpr &expr)
   return ret;
 }
 
-// Check whether all parameters in the right child of the IN/NOT_IN expr are constants. No longer
-// verify the number and structural validity of the parameters here, as this has already been
-// handled in function `ObRawExprDeduceType::check_expr_param`.
-bool ObRawExprTypeDemotion::op_row_params_is_all_const(const ObOpRawExpr &op_row) const
-{
-  bool is_all_const = true;
-  for (int64_t i = 0; is_all_const && i < op_row.get_param_count(); ++i) {
-    if (OB_ISNULL(op_row.get_param_expr(i))) {
-    } else if (T_OP_ROW == op_row.get_param_expr(i)->get_expr_type()) {
-      const ObOpRawExpr *child_op_row = static_cast<const ObOpRawExpr *>(op_row.get_param_expr(i));
-      is_all_const = op_row_params_is_all_const(*child_op_row);
-    } else {
-      is_all_const = op_row.get_param_expr(i)->is_static_const_expr();
-    }
-  }
-  return is_all_const;
-}
-
 // Since plans are stored in the plan cache, for comparisons that require type demotion,
 // we need to add range placement constraints. When the range placement derived from constant
 // analysis differs, different comparison types will be selected.
diff --git a/src/sql/resolver/expr/ob_raw_expr_type_demotion.h b/src/sql/resolver/expr/ob_raw_expr_type_demotion.h
index 552b93ffaa..77ba32b6d9 100644
--- a/src/sql/resolver/expr/ob_raw_expr_type_demotion.h
+++ b/src/sql/resolver/expr/ob_raw_expr_type_demotion.h
@@ -65,7 +65,6 @@ private:
                                ObOpRawExpr &op_expr,
                                int64_t replaced_expr_idx);
   int demote_type_in_or_not_in(ObOpRawExpr &expr);
-  bool op_row_params_is_all_const(const ObOpRawExpr &op_row) const;
   int add_range_placement_constraint(const ObColumnRefRawExpr &column_ref,
                                      const ObConstRawExpr &const_expr,
                                      const RangePlacement rp);