Re: [HACKERS] Runtime Partition Pruning

On Sat, Feb 17, 2018 at 2:27 PM, David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>
wrote:

> Hi,
>
> I've attached an updated patch, now at v10. v9 was short lived due to
> the evolution of Amit's which which this based on.
>
> This version is based on Amit's v27 of faster partition pruning [1]
> which can be applied atop of ad7dbee36.
>

Hi,

I have applied v10 patch on Amit's v27 over head ad7dbee36. I got "ERROR:
partition missing from Append subplans" with the patch. on head and only
with Amit's patches query is working fine, Please find test case below.

CREATE TABLE part ( c1 INT2, c2 DATE) PARTITION BY RANGE (c1);
CREATE TABLE part_p1 PARTITION OF part FOR VALUES FROM (0) TO (141)
PARTITION BY RANGE(c2);
CREATE TABLE part_p11 PARTITION OF part_p1 FOR VALUES FROM ('1/1/1997') TO
('2/1/1999');
CREATE TABLE part_p12 PARTITION OF part_p1 FOR VALUES FROM ('2/1/1999') TO
('2/1/2000');
CREATE TABLE part_p2 PARTITION OF part FOR VALUES FROM (141) TO (211)
PARTITION BY RANGE(c2);
CREATE TABLE part_p21 PARTITION OF part_p2 FOR VALUES FROM ('1/1/2000') TO
('2/1/2001');
CREATE TABLE part_p22 PARTITION OF part_p2 FOR VALUES FROM ('2/1/2001') TO
('2/1/2006');

INSERT INTO part VALUES (100,'1/1/1999');
INSERT INTO part VALUES (110,'1/1/1998');
INSERT INTO part VALUES (130,'1/1/2000');
INSERT INTO part VALUES (170,'1/1/2000');
INSERT INTO part VALUES (180,'1/1/2001');
INSERT INTO part VALUES (190,'1/1/2006');
INSERT INTO part VALUES (200,'1/1/2000');
INSERT INTO part VALUES (210,'1/1/2002');

postgres=# PREPARE RTP AS SELECT * FROM PART WHERE c2 BETWEEN '1/1/1998'
AND '1/1/1999';
PREPARE
postgres=# EXPLAIN execute RTP;
QUERY
PLAN
-----------------------------------------------------------------------------
Append (cost=0.00..46.00 rows=12 width=6)
-> Seq Scan on part_p11 (cost=0.00..46.00 rows=12 width=6)
Filter: ((c2 >= '1998-01-01'::date) AND (c2 <= '1999-01-01'::date))
(3 rows)

postgres=# execute RTP;
*ERROR: partition missing from Append subplans*

deallocate RTP;
DROP TABLE part;

Thanks & Regards,
Rajkumar Raghuwanshi
QMG, EnterpriseDB Corporation