Merge pull request #22006 from ClickHouse/fix-ubsan-add-month

Fix UBSan report in addMonths

base/common/DateLUTImpl.h

@@ -1069,11 +1069,11 @@ public:
     }
 
     template <typename DateOrTime>
-    inline LUTIndex addMonthsIndex(DateOrTime v, Int64 delta) const
+    inline LUTIndex NO_SANITIZE_UNDEFINED addMonthsIndex(DateOrTime v, Int64 delta) const
     {
         const Values & values = lut[toLUTIndex(v)];
 
-        Int64 month = static_cast<Int64>(values.month) + delta;
+        Int64 month = values.month + delta;
 
         if (month > 0)
         {

tests/queries/0_stateless/01770_add_months_ubsan.reference

+0

tests/queries/0_stateless/01770_add_months_ubsan.sql

+-- Result does not make sense but UBSan report should not be triggered.
+SELECT ignore(now() + INTERVAL 9223372036854775807 MONTH);