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Re: [PATCH] Use optimized single-datum tuplesort in ExecSort - Mailing list pgsql-hackers

From David Rowley
Subject Re: [PATCH] Use optimized single-datum tuplesort in ExecSort
Date
Msg-id CAApHDvrXwjjNwJ2cfOR56+ZZP9Vob-JKbRfEjDKSZz0UhtgNeg@mail.gmail.com
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In response to Re: [PATCH] Use optimized single-datum tuplesort in ExecSort  (Ranier Vilela <ranier.vf@gmail.com>)
Responses Re: [PATCH] Use optimized single-datum tuplesort in ExecSort  (Ranier Vilela <ranier.vf@gmail.com>)
Re: [PATCH] Use optimized single-datum tuplesort in ExecSort  (James Coleman <jtc331@gmail.com>)
Re: [PATCH] Use optimized single-datum tuplesort in ExecSort  (Ranier Vilela <ranier.vf@gmail.com>)
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On Thu, 15 Jul 2021 at 12:30, Ranier Vilela <ranier.vf@gmail.com> wrote:
>
> Em qua., 14 de jul. de 2021 às 21:21, David Rowley <dgrowleyml@gmail.com> escreveu:
>> But, in v8 there is no additional branch, so no branch to mispredict.
>> I don't really see how your explanation fits.
>
> In v8 the branch occurs at :
> + if (ExecGetResultType(outerPlanState(sortstate))->natts == 1)

You do know that branch is in a function that's only executed once
during executor initialization, right?

David

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