| From: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
|---|---|
| To: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Phil Florent <philflorent(at)hotmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Internal error XX000 with enable_partition_pruning=on, pg 11 beta1 on Debian |
| Date: | 2018-06-15 11:41:56 |
| Message-ID: | CAKJS1f-a8EqKAcP0emxRnz4=2OP_DLTH7GizjLzBWwg4xtzuPw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 15 June 2018 at 20:37, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> wrote:
> select * from partitioned_table_a
> union all
> select * from partitioned_table_b
>
> The only thing that changes with the patch is that
> ExecLockNonLeafAppendTables is called *twice* for the two nested Appends
> corresponding to partitioned_table_a and partitioned_table_b, resp.,
> instead of just once for the top level Append corresponding to the UNION
> ALL parent. In fact, when called for the top level Append,
> ExecLockNonLeafAppendTables is now a no-op.
If the top level Append is the UNION ALL one, then there won't be any
partitioned_rels. If that's what you mean by no-op then, yeah. There
are no duplicate locks already obtained in the parent with the child
Append node.
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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