| From: | Stephen Frost <sfrost(at)snowman(dot)net> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Improve output of BitmapAnd EXPLAIN ANALYZE |
| Date: | 2016-10-20 20:42:21 |
| Message-ID: | 20161020204221.GW13284@tamriel.snowman.net |
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| Lists: | pgsql-hackers |
Tom,
* Tom Lane (tgl(at)sss(dot)pgh(dot)pa(dot)us) wrote:
> Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com> writes:
> > A customer just pinged me wondering how it was that a BitmapAnd node was
> > reporting 0 tuples when the Bitmap Heap Scan above it showed it had in
> > fact generated tuples.
>
> > While this is mentioned in the docs, I think it would be very helpful to
> > have ANALYZE spit out "N/A" instead of 0 for these nodes.
>
> That would break code that tries to parse that stuff, eg depesz.com.
I don't believe Jim was suggesting that we back-patch such a change.
Changing it in a new major release seems entirely reasonable.
Thanks!
Stephen
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