Re: [HACKERS] sorting a union over inheritance vs pathkeys
On Jun 25, 2014, at 22:14, Tom Lane wrote: > I wrote: >> Michael Glaesemann writes: >>> -- ERROR: could not find pathkey item to sort > >> Hm ... I can reproduce that in 9.3 but it seems fine in 9.4 and HEAD. >> Don't know what's going on exactly. > > Interesting --- it appears that commit > a87c729153e372f3731689a7be007bc2b53f1410 is why it works in 9.4. I had > thought that was just improving plan quality, but it seems to also prevent > this problem. I guess we'd better back-patch it. Thanks, Tom! Michael Glaesemann grzm seespotcode net -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] sorting a union over inheritance vs pathkeys
I wrote: > Michael Glaesemann writes: >> -- ERROR: could not find pathkey item to sort > Hm ... I can reproduce that in 9.3 but it seems fine in 9.4 and HEAD. > Don't know what's going on exactly. Interesting --- it appears that commit a87c729153e372f3731689a7be007bc2b53f1410 is why it works in 9.4. I had thought that was just improving plan quality, but it seems to also prevent this problem. I guess we'd better back-patch it. I find that 9.1 through 9.3 fail with this example; it may be that it was the addition of MergeAppend support that exposed the issue. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] sorting a union over inheritance vs pathkeys
Michael Glaesemann writes: > IÂve come across an issue when creating a union over tables which includes > inheritance: > CREATE TABLE events (event_id INT NOT NULL); > -- CREATE TABLE > CREATE UNIQUE INDEX events_event_id_key ON events (event_id); > -- CREATE INDEX > CREATE TABLE legacy_events (event_id INT NOT NULL); > -- CREATE TABLE > CREATE UNIQUE INDEX legacy_events_event_id_key ON legacy_events (event_id); > -- CREATE INDEX > CREATE TABLE events_2 () INHERITS (events); > -- CREATE TABLE > -- this index isn't necessary to reproduce the error > CREATE UNIQUE INDEX events_2_event_id_key ON events_2 (event_id); > -- CREATE INDEX > SELECT event_id > FROM (SELECT event_id > FROM events >UNION ALL >SELECT event_id > FROM legacy_events) _ > ORDER BY event_id; > -- ERROR: could not find pathkey item to sort Hm ... I can reproduce that in 9.3 but it seems fine in 9.4 and HEAD. Don't know what's going on exactly. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
