Hitoshi Harada <umi.tan...@gmail.com> writes:
> 2010/10/1 Tom Lane <t...@sss.pgh.pa.us>:
>> If this patch tries to force the entire sort to happen in memory,
>> it is not committable.
> What about array_agg()? Doesn't it exceed memory even if the huge data come
> in?
Yeah, but for array_agg the user should be expecting a result of
approximately the size of the whole input, so if he overruns memory he
hasn't got a lot of room to complain. There is no reason for a user to
expect that median or percentile will fall over on large input, and
every reason to expect them to be more robust than that.
regards, tom lane
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