| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jaime Casanova <jaime(dot)casanova(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: FailedAssertion on partprune |
| Date: | 2018-08-29 17:38:57 |
| Message-ID: | CA+TgmoaiFvO_C+APsRom4Y09gfS9Qc3Mq_bRWJgHoc=z5at01w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Aug 27, 2018 at 6:05 PM, Jonathan S. Katz <jkatz(at)postgresql(dot)org> wrote:
> On behalf of the RMT, I just want to make sure this keeps moving along.
> It sounds like the next step is for Robert to verify that [3] is the
> expected
> behavior and then David can decide what to do from there.
Yes, that's the expected behavior. If we didn't regenerate the paths
there, we'd end up with
Result
-> Append
-> [various paths that produce a tlist which needs to be adjusted
later by the result node]
Instead of:
Append
-> [various paths that produce an adjusted tlist]
Paths of the former kind have already been generated; we regenerate
paths here to get the latter kind as well, which end up displacing the
old ones on cost.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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