• Vicențiu Ciorbaru's avatar
    MDEV-12851: Case with window functions query crashes server · 31ba0fa4
    Vicențiu Ciorbaru authored
    The "is null" function performs one operation which no other Item_func
    does, which is to update used tables during fix_length_and_dec().
    
    This however can not be performed before window functions have had a
    chance to resolve their order by and partition by definitions, which
    happens after the initial setup_fields call. Consequently, do not call
    Item_func_isnull update_used_tables during fix_length_and_dec().
    
    There was another issue detected once the crash was resolved.
    Because window functions did not implement is_null() method, we would
    end up returning bad results for "is null" and "is not null" functions.
    Implemented is_null() method for Item_windowfunc.
    31ba0fa4
item_windowfunc.h 22.1 KB