Re: Improve output of BitmapAnd EXPLAIN ANALYZE

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>
Cc: Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Improve output of BitmapAnd EXPLAIN ANALYZE
Date: 2016-10-20 20:35:09
Message-ID: 8872.1476995709@sss.pgh.pa.us
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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.

regards, tom lane

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