diff options
Diffstat (limited to 'sql/item.h')
| -rw-r--r-- | sql/item.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sql/item.h b/sql/item.h index 9fa384f0947..0f661b8d172 100644 --- a/sql/item.h +++ b/sql/item.h @@ -6181,6 +6181,14 @@ protected: */ bool value_cached; public: + /* + This is set if at least one of the values of a sub query is NULL + Item_cache_row returns this with null_inside(). + For not row items, it's set to the value of null_value + It is set after cache_value() is called. + */ + bool null_value_inside; + Item_cache(THD *thd): Item_basic_constant(thd), Type_handler_hybrid_field_type(&type_handler_string), @@ -6190,6 +6198,7 @@ public: fixed= 1; maybe_null= 1; null_value= 1; + null_value_inside= true; } protected: Item_cache(THD *thd, const Type_handler *handler): @@ -6201,6 +6210,7 @@ protected: fixed= 1; maybe_null= 1; null_value= 1; + null_value_inside= true; } public: |