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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
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