Re: BUG #5856: pg_attribute.attinhcount is not correct.

On Mon, Jan 31, 2011 at 6:42 AM, Naoya Anzai
<anzai-naoya@mxu.nes.nec.co.jp> wrote:
> In PostgreSQL8.4.5, I found that the catalog pg_attribute.attinhcount is =
not
> correct.
>
> I executed the following queries.
>
> --------------------------------------------------------------------------
> create table "3_grandchild"();
> create table "2_child"();
> create table "1_parent"();
>
> alter table "3_grandchild" inherit "2_child";
> alter table "2_child" inherit "1_parent";
>
> alter table "3_grandchild" add column c1 text;
> alter table "2_child" add column c1 text;
> alter table "1_parent" add column c1 text;
>
> select c.relname,a.attname,a.attinhcount from pg_attribute a,pg_class c
> where a.attrelid=3Dc.oid
> and relname in ('1_parent','2_child','3_grandchild')
> and attname not in('xmax','xmin','cmin','cmax','tableoid','ctid')
> order by relname;
>
> =A0 =A0relname =A0 =A0| attname | attinhcount
> =A0--------------+---------+-------------
> =A01_parent =A0 =A0 | c1 =A0 =A0 =A0| =A0 =A0 =A0 =A0 =A0 0
> =A02_child =A0 =A0 =A0| c1 =A0 =A0 =A0| =A0 =A0 =A0 =A0 =A0 1
> =A03_grandchild | c1 =A0 =A0 =A0| =A0 =A0 =A0 =A0 =A0 2
> =A0(3 rows)
> --------------------------------------------------------------------------
>
> "3_grandchild"'s attinhcount should be 1.

I think this is a manifestation the same problem mentioned here:

http://git.postgresql.org/gitweb?p=3Dpostgresql.git;a=3Dcommit;h=3D31b6fc06=
d83c6de3644c8f2921eb7de0eb92fac3

I believe this requires some refactoring to fix.  It would be good to do th=
at.

--=20
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company