Re: TRAP: FailedAssertion("HaveRegisteredOrActiveSnapshot()", File: "toast_internals.c", Line: 670, PID: 19403)

At Tue, 29 Mar 2022 13:29:15 +0200, Erik Rijkers <er(at)xs4all(dot)nl> wrote in
> Op 29-03-2022 om 12:50 schreef Matthias van de Meent:
> > An shorter (?) reproducer might be the following, which forces any
> > value for 'a' to be toasted and thus triggering the check in
> > init_toast_snapshot regardless of value length:
> > CREATE TABLE t (a text);
> > ALTER TABLE t ALTER COLUMN a SET STORAGE EXTERNAL;
> > INSERT INTO t VALUES ('toast');
> > BEGIN;
> > DECLARE c CURSOR FOR SELECT * FROM t;
> > FETCH ALL IN c;

Yeah, unfortunately I tried that first and saw it didn't work. And it
still doesn't for me. With such a short text pg_detoast_datum_pakced
doesn't call detoast_attr. Actually it is VARATT_IS_1B. (@master)

I think I'm missing something here. I'm going to examine around.

regards.

--
Kyotaro Horiguchi
NTT Open Source Software Center