I wrote:
> Andres Freund <and...@anarazel.de> writes:
>> It'd be useful for FieldStore - we'd not have to error out anymore if
>> the number of columns changes (which I previously had "solved" by using
>> MaxHeapAttributeNumber sized values/nulls array).

> Ah, I see.  But in that case you're not really truncating the tuple
> --- what you want is to be allowed to pass undersized datum/nulls
> arrays and have the missing columns be taken as nulls.

No, scratch that: you can't use an "extended" heap_form_tuple to solve
that problem, because it's not only the form-tuple end but the
deform-tuple end that needs fullsize arrays.  Otherwise, we'd be losing
trailing-column values in the deform-and-reform cycle.  So I still
don't see that there's a valid application for this feature.

                        regards, tom lane

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