3 commits

Author	SHA1	Message	Date
Vicențiu Ciorbaru	aa74fef25e	Fix 2 more bugs in item_windowfunc. ... 1. Item_windowfunc must check the nullness of the field if it returns the value from the result_field. 2. The decimal value must come from the window_func instead of the result_field when not fetching values from the result_field. Added a more extensive test case that highlights if these bugs occur. The 2 select statements check behaviour for decimal and real typed fields respectively.	2016-03-16 01:42:45 +02:00
Sergei Petrunia	833304313d	Continuation of "Implemented a counter within Item_sum_sum" a few commits before ... Query result had 0 where it should have had NULLs: - Make Item_window_func::val* functions honor NULL-handling conventions: 1. set null_value to indicate whether we've returned a NULL value 2. val_str and val_decimal should return NULL pointer when they're returning SQL NULL value. Fix assertion failure when sending results to network. - The assert was due to window func returing SQL NULL despite having maybe_null=false - Fixed by settting Item_window_func::maybe_null correctly in fix_fields	2016-03-16 01:26:39 +03:00
Vicențiu Ciorbaru	a0c06ba1ed	Preliminary implementation for the aggregate sum function as a window function ... This implementation does not deal with the case where removal of elements from the window frame causes the item to turn to a null value.	2016-03-14 15:42:00 +02:00