kaa@kaamos.(none) 4ca61aa36e Fix for bug #34512: CAST( AVG( double ) AS DECIMAL ) ...

returns wrong results

Casting AVG() to DECIMAL led to incorrect results when the arguments
had a non-DECIMAL type, because in this case
Item_sum_avg::val_decimal() performed the division by the number of
arguments twice.

Fixed by changing Item_sum_avg::val_decimal() to not rely on
Item_sum_sum::val_decimal(), i.e. calculate sum and divide using
DECIMAL arithmetics for DECIMAL arguments, and utilize val_real() with
subsequent conversion to DECIMAL otherwise.

2008-03-06 18:19:47 +03:00

30 KiB

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