Hi. I tried this feature with the latest snapshot. When I executed the following SQL statement, multiple primary keys were created on the partition. Is this the intended behavior?
-- test postgres=> CREATE TABLE part1(c1 INT PRIMARY KEY, c2 INT, c3 VARCHAR(10)) PARTITION BY RANGE(c1) ; CREATE TABLE postgres=> CREATE TABLE part1v1 (LIKE part1) ; CREATE TABLE postgres=> ALTER TABLE part1v1 ADD CONSTRAINT pk_part1v1 PRIMARY KEY (c1, c2) ; ALTER TABLE postgres=> ALTER TABLE part1 ATTACH PARTITION part1v1 FOR VALUES FROM (100) TO (200) ; ALTER TABLE postgres=> \d part1v1 Table "public.part1v1" Column | Type | Collation | Nullable | Default --------+-----------------------+-----------+----------+--------- c1 | integer | | not null | c2 | integer | | not null | c3 | character varying(10) | | | Partition of: part1 FOR VALUES FROM (100) TO (200) Indexes: "part1v1_pkey" PRIMARY KEY, btree (c1) "pk_part1v1" PRIMARY KEY, btree (c1, c2) Regards, Noriyoshi Shinoda -----Original Message----- From: Amit Langote [mailto:langote_amit...@lab.ntt.co.jp] Sent: Tuesday, February 20, 2018 6:24 PM To: Alvaro Herrera <alvhe...@alvh.no-ip.org>; Peter Eisentraut <peter.eisentr...@2ndquadrant.com>; Jaime Casanova <jaime.casan...@2ndquadrant.com> Cc: Jesper Pedersen <jesper.peder...@redhat.com>; Pg Hackers <pgsql-hack...@postgresql.org> Subject: Re: unique indexes on partitioned tables Hi. On 2018/02/20 5:45, Alvaro Herrera wrote: > I pushed this now, with fixes for the last few comments there were. I noticed with the commit that, while ON CONFLICT (conflict_target) DO UPDATE gives a less surprising error message by catching it in the parser, ON CONFLICT (conflict_target) DO NOTHING will go into the executor without the necessary code to handle the case. Example: create table p (a int primary key, b text) partition by list (a); create table p12 partition of p for values in (1, 2); create table p3 partition of p (a unique) for values in (3); insert into p values (1, 'a') on conflict (a) do nothing; ERROR: unexpected failure to find arbiter index Attached is a patch to fix that. Actually, there are two -- one that adjusts the partitioned table tests in insert_conflict.sql to have a partitioned unique index and another that fixes the code. I suppose we'd need to apply this temporarily until we fix the ON CONFLICT (conflict_target) case to be able to use partitioned indexes. Thanks, Amit