Thomas Lockhart <lockhart@fourpalms.org> writes:
> I've been wanting to ask: we have in a few cases moved aggregate
> calculations from small, fast data types to using numeric as the
> accumulator.
Which ones are you concerned about? As of 7.2, the only ones that use
numeric accumulators for non-numeric input types are
aggname | basetype | aggtransfn | transtype
----------+-------------+---------------------+-------------avg | int8 | int8_accum | _numericsum
| int8 | int8_sum | numericstddev | int2 | int2_accum | _numericstddev | int4
| int4_accum | _numericstddev | int8 | int8_accum | _numericvariance | int2 |
int2_accum | _numericvariance | int4 | int4_accum | _numericvariance | int8 | int8_accum
| _numeric
All of these seem to have good precision/range arguments for using
numeric accumulators, or to be enough off the beaten track that it's
not worth much angst to optimize them.
regards, tom lane
