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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Ondřej Jirman <ienieghapheoghaiwida@xff.cz>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #16129: Segfault in tts_virtual_materialize in logical replication worker
Date: Thu, 21 Nov 2019 19:45:34 -0500
Message-ID: <16189.1574383534@sss.pgh.pa.us> (raw)
In-Reply-To: <20191122003626.ydgwvjfx363blgip@core.my.home>
References: <20191121143503.nkdwgjwb7xjopeuq@development>
	<20191121150716.szxqukxrtpjpckm3@core.my.home>
	<20191121152732.hu6y4wzw7nkxpsvk@development>
	<20191121155707.pqkgjphh65o5fapz@core.my.home>
	<20191121161502.xfiy65i3cm6adscr@core.my.home>
	<20191121165752.dffge6bh756xlfdg@development>
	<20191121173555.midj6vp4dmiiqs24@core.my.home>
	<20191121185844.6qsqhwzzuhu3fpsg@core.my.home>
	<20191121214115.3tgefmvkmrzaim74@development>
	<20191121220854.ebdzjtloel56sfwu@development>
	<20191122003626.ydgwvjfx363blgip@core.my.home>

=?utf-8?Q?Ond=C5=99ej?= Jirman <ienieghapheoghaiwida@xff.cz> writes:
> On Thu, Nov 21, 2019 at 11:08:54PM +0100, Tomas Vondra wrote:
>> 1) Print newtup.values and newtup.changed matches, so that we can check
>> it contains the tuple I shared before? There should be 8 elements in
>> each, with 'values' being values formatted as text, and 'changed' being
>> flags which values were updated.

> newtup.changed

> {true, true, false, true, true, true, true, true, false <repeats 1656 times>}

So column 3 is not getting replaced.  That seems to jibe with my
theory that slot_modify_cstrings is failing to handle that case
correctly.  Can you try applying the patch I posted and see if
it fixes the issue for you?

			regards, tom lane





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