|From:||Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>|
|To:||Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Jaime Casanova <jaime(dot)casanova(at)2ndquadrant(dot)com>|
|Cc:||Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>|
|Subject:||Re: unique indexes on partitioned tables|
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I pushed this now, with fixes for the last few comments there were.
Peter Eisentraut wrote:
> I don't understand the variable name "third". I don't see a "first" or
> "second" nearby.
Hah. That was referring to variables "myself" and "referenced". I
changed the variable name to "parentConstr".
> I find some of the columns in pg_constraint confusing. For a primary
> key on a partitioned table, for the PK on the partition I get
> conislocal = false, coninhcount = 1, connoinherit = true
> The last part is confusing to me.
Yeah, I think it was patently wrong. I changed it so that connoinherit
becomes true in this case.
Alvaro Herrera wrote:
> Jaime Casanova wrote:
> > also noted that if you:
> > """
> > create table t1(i int) partition by hash (i);
> > create table t1_0 partition of t1 for values with (modulus 2, remainder 0);
> > create table t1_1 partition of t1 for values with (modulus 2, remainder 1);
> > create unique index on t1(i);
> > alter table t1 add primary key using index t1_i_idx ;
> > """
> > the ALTER TABLE ADD PK does not recurse to partitions, which maybe is
> > perfectly fine because i'm using USING INDEX but it feels like an
> > oversight to me
> Ouch. Yeah, this is a bug. I'll try to come up with something.
After looking at it for a few minutes I determined that adding this
feature requires some more work: you need to iterate on all partitions,
obtain the corresponding index, cons up a few fake parse nodes, then
recurse to create the PK in the children. I think this should be doable
with a couple dozen lines of code, but it's a refinement that can be
added on top. Care to submit a patch? In the meantime, I added an
ereport(ERROR) to avoid leaving the system in an inconsistent state
(that probably would not even be reproduced correctly by pg_dump).
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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