Tomas Vondra <tomas.von...@2ndquadrant.com> writes:
> But what about computing the number of expected batches, but always
> start executing assuming no batching? And only if we actually fill
> work_mem, we start batching and use the expected number of batches?
Hmm. You would likely be doing the initial data load with a "too small"
numbuckets for single-batch behavior, but if you successfully loaded all
the data then you could resize the table at little penalty. So yeah,
that sounds like a promising approach for cases where the initial rowcount
estimate is far above reality.
But I kinda thought we did this already, actually.
regards, tom lane
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