On 21/12/2021, at 10:25 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> Not quite like that.  Look into nodeAgg.c, which solves a similar problem
> for the transvalues themselves with code like
> 
>            /* forget the old value, if any */
>            if (!oldIsNull && !pertrans->inputtypeByVal)
>                pfree(DatumGetPointer(oldVal));

Oh great, thanks for the tip!

— m@

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