Re: Multiple primary key on partition table?

Nice catch Rajkumar.

In index_check_primary_key(), relationHasPrimaryKey() called only for the an
alter command but I think we need to call in this case as well, like this:

diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 7eb3e35166..c8714395fe 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -223,7 +223,7 @@ index_check_primary_key(Relation heapRel,
     * and CREATE INDEX doesn't have a way to say PRIMARY KEY, so it's no
     * problem either.
     */
-   if (is_alter_table &&
+   if ((is_alter_table || heapRel->rd_rel->relispartition) &&
        relationHasPrimaryKey(heapRel))
    {
        ereport(ERROR,

Thoughts?

Regards,
Amul
On Mon, Sep 17, 2018 at 4:51 PM Rajkumar Raghuwanshi
<rajkumar.raghuwanshi@enterprisedb.com> wrote:
>
> Hi,
>
> I am able to create multiple primary key on partition table by executing below statement.
>
> [edb@localhost bin]$ ./psql postgres
> psql (11beta3)
> Type "help" for help.
>
> postgres=# CREATE TABLE t1 (a int PRIMARY KEY,b int) PARTITION BY RANGE (a);
> CREATE TABLE
> postgres=# CREATE TABLE t1_p1 PARTITION OF t1 (b PRIMARY KEY) FOR VALUES FROM (MINVALUE) TO (MAXVALUE);
> CREATE TABLE
> postgres=# \d+ t1_p1
>                                    Table "public.t1_p1"
>  Column |  Type   | Collation | Nullable | Default | Storage | Stats target | Description
> --------+---------+-----------+----------+---------+---------+--------------+-------------
>  a      | integer |           | not null |         | plain   |              |
>  b      | integer |           | not null |         | plain   |              |
> Partition of: t1 FOR VALUES FROM (MINVALUE) TO (MAXVALUE)
> Partition constraint: (a IS NOT NULL)
> Indexes:
>     "t1_p1_pkey" PRIMARY KEY, btree (a)
>     "t1_p1_pkey1" PRIMARY KEY, btree (b)
>
> Is this fine to allow it?
> eventually it cause to pg_upgrade failed with below error.
>
> pg_restore: creating TABLE "public.t1"
> pg_restore: creating TABLE "public.t1_p1"
> pg_restore: INFO:  partition constraint for table "t1_p1" is implied by existing constraints
> pg_restore: creating CONSTRAINT "public.t1 t1_pkey"
> pg_restore: creating CONSTRAINT "public.t1_p1 t1_p1_pkey"
> pg_restore: creating CONSTRAINT "public.t1_p1 t1_p1_pkey1"
> pg_restore: [archiver (db)] Error while PROCESSING TOC:
> pg_restore: [archiver (db)] Error from TOC entry 2920; 2606 16395 CONSTRAINT t1_p1 t1_p1_pkey1 edb
> pg_restore: [archiver (db)] could not execute query: ERROR:  multiple primary keys for table "t1_p1" are not allowed
>     Command was:
> -- For binary upgrade, must preserve pg_class oids
> SELECT pg_catalog.binary_upgrade_set_next_index_pg_class_oid('16394'::pg_catalog.oid);
>
> ALTER TABLE ONLY "public"."t1_p1"
>     ADD CONSTRAINT "t1_p1_pkey1" PRIMARY KEY ("b");
>
> Thanks & Regards,
> Rajkumar Raghuwanshi
> QMG, EnterpriseDB Corporation