Re: SQL/JSON: JSON_TABLE - pg_stat_statements crash

From: Erik Rijkers <er(at)xs4all(dot)nl>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Nikita Glukhov <n(dot)gluhov(at)postgrespro(dot)ru>, David Steele <david(at)pgmasters(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Cc: Michael Paquier <michael(at)paquier(dot)xyz>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Oleg Bartunov <obartunov(at)gmail(dot)com>, Zhihong Yu <zyu(at)yugabyte(dot)com>
Subject: Re: SQL/JSON: JSON_TABLE - pg_stat_statements crash
Date: 2021-09-14 18:04:18
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On 9/14/21 2:53 PM, Andrew Dunstan wrote:
> On 9/13/21 5:41 AM, Erik Rijkers wrote:
>> On 9/2/21 8:52 PM, Andrew Dunstan wrote:

>> [0001-SQL-JSON-functions-v51.patch]
>> [0002-JSON_TABLE-v51.patch]
>> [0003-JSON_TABLE-PLAN-DEFAULT-clause-v51.patch]
>> [0004-JSON_TABLE-PLAN-clause-v51.patch]

Thanks, builds fine now.

But I found that the server crashes on certain forms of SQL when
postgresql.conf has a 'shared_preload_libraries' that contains module
'pg_stat_statements' (my value was:
'pg_stat_statements,auth_delay,auto_explain,passwordcheck'). Only
pg_stat_statements seems to cause the problem.

The offending SQL (I took it from the jsonb_sqljson.sql test file):

testdb=# SELECT JSON_EXISTS(jsonb '{"a": 1, "b": 2}', '$.* ? (@ > $x &&
@ < $y)' PASSING 0 AS x, 2 AS y);
server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
Time: 2.551 ms

(Of course, that SQL running during regression testing has no problems
as there is then no pg_stat_statements.)

The statement sometimes succeeds but never very often.

The same crash was there before but I only now saw the connection with
the 'shared_preload_libraries/pg_stat_statements'.

I seem to remember some things changed in pg_stat_statements but I
didn't follow and don't know who to CC for it.


Erik Rijkers

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