diff --git a/src/sql/resolver/dml/ob_column_namespace_checker.cpp b/src/sql/resolver/dml/ob_column_namespace_checker.cpp
index 6dabf76425..8730dce620 100644
--- a/src/sql/resolver/dml/ob_column_namespace_checker.cpp
+++ b/src/sql/resolver/dml/ob_column_namespace_checker.cpp
@@ -278,12 +278,8 @@ int ObColumnNamespaceChecker::check_column_exists(const TableItem &table_item, c
       for (int64_t i = 0; OB_SUCC(ret) && i < ref_stmt->get_select_item_size(); ++i) {
         SelectItem& tmp_select_item = ref_stmt->get_select_item(i);
         if (ObCharset::case_compat_mode_equal(col_name, tmp_select_item.alias_name_)) {
-          unduplicable_count += ((tmp_select_item.expr_->is_column_ref_expr()
-                  && static_cast<ObColumnRefRawExpr *>(tmp_select_item.expr_)->is_joined_dup_column())
-                  || !(tmp_select_item.expr_->is_aggr_expr())) ? 0 : 1;
-          /* Unduplicable_count is use for column duplicated report in oracle mode.
-           * It seems only aggr funcs in PIVOT shoulds cause this error.
-           */
+          unduplicable_count += (tmp_select_item.expr_->is_column_ref_expr()
+                  && !(static_cast<ObColumnRefRawExpr *>(tmp_select_item.expr_)->is_joined_dup_column())) ? 1 : 0;
           if (!is_exist) {
             // set the is_exist = true, is there is a column with the same column name.
             // no matter the column is a duplicable column, we should set the exists to true.