On Tue, Jan 17, 2017 at 4:26 AM, Rushabh Lathia
<rushabh.lat...@gmail.com> wrote:
> Another observation is, HashAggregate (case 1) is performs better compare to
> GroupAggregate (case 2), but still it doesn't justify the cost difference of
> those two.

It may not be the only issue, or even the main issue, but I'm fairly
suspicious of the fact that cost_sort() doesn't distinguish between
the comparison cost of text and int4, for example.

Peter Geoghegan

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