日 9:47
To: Wang, Chaoyong
Cc: pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] problem when optimizing the window aggregation
"Wang, Chaoyong" writes:
> I used the function datumCopy as following:
> peraggstate->transValue = datumCopy(peraggstate->tempTransValue,
>
"Wang, Chaoyong" writes:
> I used the function datumCopy as following:
> peraggstate->transValue = datumCopy(peraggstate->tempTransValue,
> peraggstate->transtypeByVal, peraggstate->transtypeLen);
You need to guard that with an is-null check, because datumCopy isn't
designed to cope with null va
Hi,
I'm trying to reduce the re-computing of window aggregation. Here the
AVG function for example.
The original window aggregation's transition value(transValue) of AVG is
an ArrayType, that contains two main values(sum, count).
Now, I'm using a temporary transition value (tempTransVa
