From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Justin Pryzby <pryzby(at)telsasoft(dot)com>, Tomas Vondra <tv(at)fuzzy(dot)cz>, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: ANALYZE: ERROR: tuple already updated by self |
Date: | 2019-06-19 00:08:37 |
Message-ID: | 20190619000837.awy6j7h45ahd4vop@alap3.anarazel.de |
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Lists: | pgsql-hackers |
Hi,
On 2019-06-18 18:48:58 -0500, Justin Pryzby wrote:
> Ah: the table is an inheritence parent. If I uninherit its child, there's no
> error during ANALYZE. MV stats on the child are ok:
It's a "classical" inheritance parent, not a builtin-partitioning type
of parent, right? And it contains data?
I assume it ought to not be too hard to come up with a reproducer
then...
I think the problem is pretty plainly that for inheritance tables we'll
try to store extended statistics twice. And thus end up updating the
same row twice.
> #6 0x0000000000588346 in do_analyze_rel (onerel=0x7fee16140de8, options=2, params=0x7ffe5b6bf8b0, va_cols=0x0, acquirefunc=0x492b4, relpages=36, inh=true, in_outer_xact=false, elevel=13) at analyze.c:627
/* Build extended statistics (if there are any). */
BuildRelationExtStatistics(onerel, totalrows, numrows, rows, attr_cnt,
vacattrstats);
Note that for plain statistics we a) pass down the 'inh' flag to the
storage function, b) stainherit is part of pg_statistics' key:
Indexes:
"pg_statistic_relid_att_inh_index" UNIQUE, btree (starelid, staattnum, stainherit)
Tomas, I think at the very least extended statistics shouldn't be built
when building inherited stats. But going forward I think we should
probably have it as part of the key for pg_statistic_ext.
Greetings,
Andres Freund
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