diff --git a/src/sql/rewrite/ob_query_range_define.cpp b/src/sql/rewrite/ob_query_range_define.cpp
index 7f3a5aac5..94d2bf148 100644
--- a/src/sql/rewrite/ob_query_range_define.cpp
+++ b/src/sql/rewrite/ob_query_range_define.cpp
@@ -608,12 +608,14 @@ int ObPreRangeGraph::preliminary_extract_query_range(const ObIArray<ColumnItem>
                                                      const ColumnIdInfoMap *geo_column_id_map /* = NULL*/)
 {
   int ret = OB_SUCCESS;
-  ObRawExprFactory expr_factory(allocator_);
   ObQueryRangeCtx ctx(exec_ctx);
-  if (OB_FAIL(fill_column_metas(range_columns))) {
+  if (OB_ISNULL(exec_ctx)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("get unexpeced null", K(ret), K(exec_ctx));
+  } else if (OB_FAIL(fill_column_metas(range_columns))) {
     LOG_WARN("failed to fill column metas");
   } else if (OB_FAIL(ctx.init(this, range_columns, expr_constraints,
-                              params, &expr_factory,
+                              params, exec_ctx->get_expr_factory(),
                               phy_rowid_for_table_loc, ignore_calc_failure, index_prefix,
                               geo_column_id_map))) {
     LOG_WARN("failed to init query range context");