RE: How to retrieve the partition info for each partition table?

[Igor Neyman]

From: Yuxia Qiu [mailto:yuxiaq...@gmail.com]
Sent: Wednesday, October 24, 2018 1:29 PM
To: 
pgsql-general@lists.postgresql.org<mailto:pgsql-general@lists.postgresql.org>
Subject: How to retrieve the partition info for each partition table?

HI,

   I have created some partition table, as example bellow:
CREATE TABLE public.measurement
(
    city_id integer NOT NULL,
    logdate date NOT NULL,
    peaktemp integer,
    unitsales integer
) PARTITION BY RANGE (logdate) ;

CREATE TABLE public.measurement_y2006m02 PARTITION OF public.measurement
    FOR VALUES FROM ('2006-02-01') TO ('2006-03-01');

CREATE TABLE public.measurement_y2006m03 PARTITION OF public.measurement
    FOR VALUES FROM ('2006-03-01') TO ('2006-04-01');

I know how to get a list partition tables for above example by calling :
SELECT i.inhrelid::regclass AS child
FROM   pg_inherits i
WHERE  i.inhparent = 'public.measurement'::regclass;

My question is: how to get the value boundary for each partition table like 
bellow?
measurement_y2006m02       FROM ('2006-02-01') TO ('2006-03-01')
measurement_y2006m03       FROM ('2006-03-01') TO ('2006-04-01')

Thanks,
Yuxia

Better yet:

SELECT relname, pg_get_expr(relpartbound, oid) FROM pg_class WHERE relpartbound 
IS NOT NULL;

Regards,
Igor Neyman