Re: BRIN INDEX value

On Fri, Sep 4, 2015 at 10:03 AM, Tatsuo Ishii <ishii@postgresql.org> wrote:
>
> I have looked into your patch and am a little bit worried because it
> calls RelationGetNumberOfBlocks() which is an expensive function.
> I think there are two ways to avoid it.
>
> 1) fall back to your former patch. However it may break existing
>    behavior what you said. I think there's very little chance it
>    actually happens because IndexBuildHeapRangeScan() is only used by
>    brin (I confirmed this). But Alvaro said some patches may be it's
>    customers. Robert, Amit, Can you please confirm this?
>

In earlier version of parallel_seqscan patch, heap_setscanlimits() was being

used, but now altogether a different mechanism is used.