diff --git a/src/sql/rewrite/ob_predicate_deduce.cpp b/src/sql/rewrite/ob_predicate_deduce.cpp
index 968550695..ab848c274 100644
--- a/src/sql/rewrite/ob_predicate_deduce.cpp
+++ b/src/sql/rewrite/ob_predicate_deduce.cpp
@@ -211,7 +211,7 @@ int ObPredicateDeduce::choose_unequal_preds(ObTransformerCtx &ctx,
   if (OB_FAIL(topo_sort(topo_order_))) {
     LOG_WARN("failed to topo sort", K(ret));
   }
-  for (int64_t i = 0; i < topo_order_.count(); ++i) {
+  for (int64_t i = 0; OB_SUCC(ret) && i < topo_order_.count(); ++i) {
     // if a variable A equal with a const B,
     // there is no need to deduce unequal predicates like A > c1 for A
     // because, it is better to replace that with B > c1
diff --git a/src/sql/rewrite/ob_transform_utils.cpp b/src/sql/rewrite/ob_transform_utils.cpp
index 007124237..993ee5fb2 100644
--- a/src/sql/rewrite/ob_transform_utils.cpp
+++ b/src/sql/rewrite/ob_transform_utils.cpp
@@ -2489,8 +2489,13 @@ int ObTransformUtils::is_general_expr_not_null(ObNotNullContext &ctx,
       }
     }
   } else if (T_FUN_SYS_CAST == expr->get_expr_type()) {
-    if (OB_FAIL(check_list.push_back(expr->get_param_expr(0)))) {
-      LOG_WARN("failed to append check list", K(ret));
+    const ObExprResType &res_type = expr->get_result_type();
+    if (res_type.is_numeric_type()
+        || res_type.is_string_or_lob_locator_type()
+        || res_type.is_oracle_temporal_type()) {
+      if (OB_FAIL(check_list.push_back(expr->get_param_expr(0)))) {
+        LOG_WARN("failed to append check list", K(ret));
+      }
     }
   } else if (T_FUN_SYS_NVL == expr->get_expr_type()) {
     if (OB_FAIL(check_list.push_back(expr->get_param_expr(1)))) {