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From: David Rowley <[email protected]>
To: Ilia Evdokimov <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Lukas Fittl <[email protected]>
Cc: Daniel Gustafsson <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: Nikolay Samokhvalov <[email protected]>
Cc: Andrei Lepikhov <[email protected]>
Subject: Re: Add estimated hit ratio to Memoize in EXPLAIN to explain cost adjustment
Date: Wed, 2 Apr 2025 10:06:59 +1300
Message-ID: <CAApHDvpT0Y1BfYgeWz+PkKaLBEff1izYOAjNSibhBTNFEdqLtg@mail.gmail.com> (raw)
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On Tue, 1 Apr 2025 at 20:52, Ilia Evdokimov
<[email protected]> wrote:
> With the feature freeze coming up soon, I’d like to ask: do we plan to
> include this patch in v18?

I don't think there's a clear enough consensus yet on what EXPLAIN
should display. We'd need that beforehand. There are now less than 7
days to get that, so it might be unrealistic.

I tried to move things along to address Tom's concern about not
wanting to show this in EXPLAIN's standard output. I suggested in [1]
that we could use EXPLAIN ANALYZE, but nobody commented on that.
EXPLAIN ANALYZE is much more verbose than EXPLAIN already, and if we
put these in EXPLAIN ANALYZE then the viewer can more easily compare
planned vs actual. I had mentioned that Hash Join does something like
this for buckets.

David

[1] https://postgr.es/m/CAApHDvqPkWmz1Lq23c9CD+mAW=hgPrD289tC30f3H1f6Ng59+g@mail.gmail.com

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