From: Justin Pryzby <pryzby@telsasoft.com>
To: Tomas Vondra <tomas.vondra@enterprisedb.com>
Cc: Dean Rasheed <dean.a.rasheed@gmail.com>
Cc: pgsql-hackers@postgresql.org
Subject: Re: PoC/WIP: Extended statistics on expressions
Date: Wed, 24 Mar 2021 04:17:08 -0500
Message-ID: <20210324091708.GC28335@telsasoft.com> (raw)
In-Reply-To: <b8359875-b91f-ff48-4c6c-9b3c1c35d880@enterprisedb.com>
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On Wed, Mar 24, 2021 at 09:54:22AM +0100, Tomas Vondra wrote:
> Hi Justin,
>
> Unfortunately the query is incomplete, so I can't quite determine what
> went wrong. Can you extract the full query causing the crash, either
> from the server log or from a core file?
Oh, shoot, I didn't realize it was truncated, and I already destroyed the core
and moved on to something else...
But this fails well enough, and may be much shorter than the original :)
select distinct
pg_catalog.variance(
cast(pg_catalog.pg_stat_get_bgwriter_timed_checkpoints() as int8)) over (partition by subq_0.c2 order by subq_0.c0) as c0,
subq_0.c2 as c1, subq_0.c0 as c2, subq_0.c2 as c3, subq_0.c1 as c4, subq_0.c1 as c5, subq_0.c0 as c6
from
(select
ref_1.foreign_server_catalog as c0,
ref_1.authorization_identifier as c1,
sample_2.tgname as c2,
ref_1.foreign_server_catalog as c3
from
pg_catalog.pg_stat_database_conflicts as ref_0
left join information_schema._pg_user_mappings as ref_1
on (ref_0.datname < ref_0.datname)
inner join pg_catalog.pg_amproc as sample_0 tablesample system (5)
on (cast(null as uuid) < cast(null as uuid))
left join pg_catalog.pg_aggregate as sample_1 tablesample system (2.9)
on (sample_0.amprocnum = sample_1.aggnumdirectargs )
inner join pg_catalog.pg_trigger as sample_2 tablesample system (1) on true )subq_0;
TRAP: FailedAssertion("bms_num_members(varnos) == 1", File: "selfuncs.c", Line: 3332, PID: 16422)
Also ... with this patch CREATE STATISTIC is no longer rejecting multiple
tables, and instead does this:
postgres=# CREATE STATISTICS xt ON a FROM t JOIN t ON true;
ERROR: schema "i" does not exist
--
Justin
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To: pgsql-hackers@postgresql.org
Cc: pryzby@telsasoft.com, tomas.vondra@enterprisedb.com, dean.a.rasheed@gmail.com
Subject: Re: PoC/WIP: Extended statistics on expressions
In-Reply-To: <20210324091708.GC28335@telsasoft.com>
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