diff --git a/src/sql/engine/expr/ob_expr_time.cpp b/src/sql/engine/expr/ob_expr_time.cpp
index 1d082f070a..605dd40f9d 100644
--- a/src/sql/engine/expr/ob_expr_time.cpp
+++ b/src/sql/engine/expr/ob_expr_time.cpp
@@ -40,7 +40,7 @@ int ObExprTime::calc_result_type1(ObExprResType& type, ObExprResType& type1, ObE
   int16_t scale1 = MIN(type1.get_scale(), MAX_SCALE_FOR_TEMPORAL);
   int16_t scale = (SCALE_UNKNOWN_YET == scale1) ? MAX_SCALE_FOR_TEMPORAL : scale1;
   type.set_scale(scale);
-  UNUSED(type_ctx);
+  type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_NULL_ON_WARN);
   return ret;
 }
 
diff --git a/src/sql/engine/expr/ob_expr_time.h b/src/sql/engine/expr/ob_expr_time.h
index 82a5fbaff3..c939fbeba7 100644
--- a/src/sql/engine/expr/ob_expr_time.h
+++ b/src/sql/engine/expr/ob_expr_time.h
@@ -24,6 +24,10 @@ public:
   virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
   virtual int calc_result1(common::ObObj& result, const common::ObObj& time, common::ObExprCtx& expr_ctx) const;
   virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  virtual common::ObCastMode get_cast_mode() const override
+  {
+    return CM_NULL_ON_WARN;
+  }
   static int calc_time(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
 
 private: