Re: [HACKERS] fix possible optimizations in ATExecAttachPartition()
On Wed, Jun 14, 2017 at 2:12 AM, Robert Haaswrote: > On Tue, Jun 13, 2017 at 5:22 AM, Amit Langote > wrote: > > Yeah, I was thinking the same while writing the patch posted on the > thread > > "A bug in mapping attributes in ATExecAttachPartition()" [1]. That patch > > adds the break you mention in 2, but didn't do anything about point 1. > > > > In any case, +1 to your patch. I'll rebase if someone decides to commit > > it first. > > If the patch I posted in > https://www.postgresql.org/message-id/CA%2BTgmoYmW9VwCWDpe7eXUxeKmAKOxm > g8itgFkB5UTQTq4SnTjQ%40mail.gmail.com > gets committed, all of this code will be gone entirely, so this will > be moot. If we decide to repair the existing broken logic rather than > ripping it out entirely then this is probably a good idea, but I hope > that's not what happens. > That seems a better option to me too. +1 Regards, Jeevan Ladhe
Re: [HACKERS] fix possible optimizations in ATExecAttachPartition()
On Tue, Jun 13, 2017 at 5:22 AM, Amit Langotewrote: > Yeah, I was thinking the same while writing the patch posted on the thread > "A bug in mapping attributes in ATExecAttachPartition()" [1]. That patch > adds the break you mention in 2, but didn't do anything about point 1. > > In any case, +1 to your patch. I'll rebase if someone decides to commit > it first. If the patch I posted in https://www.postgresql.org/message-id/CA%2BTgmoYmW9VwCWDpe7eXUxeKmAKOxmg8itgFkB5UTQTq4SnTjQ%40mail.gmail.com gets committed, all of this code will be gone entirely, so this will be moot. If we decide to repair the existing broken logic rather than ripping it out entirely then this is probably a good idea, but I hope that's not what happens. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] fix possible optimizations in ATExecAttachPartition()
On 2017/06/13 18:08, Jeevan Ladhe wrote: > Hi, > > I was doing some testing for my default partitioning work, and I realized > that > there seem to be a some optimization possible (and I think we should really > have > this optimization) for logic around handling the "key IS NOT NULL" > constraints > followed by predicate_implied_by() call. > > 1. Consider, if predicate_implied_by() returns false, in that case > skip_validate > is left set to false, and we really do not want to do lots of stuff followed > this decision just to prove that the scan cannot be avoided(which is already > decided in this case) if there is no NOT NULL constraint on the partition > key > column. > > 2. Further, if we have already decided not to skip the scan, we should > really have > a break in following if block: > > if (!partition_accepts_null && > (partattno == 0 || > !bms_is_member(partattno, not_null_attrs))) > skip_validate = false; > > > I have made above changes in the attached patch. > PFA, and let me know if I am missing something here. Yeah, I was thinking the same while writing the patch posted on the thread "A bug in mapping attributes in ATExecAttachPartition()" [1]. That patch adds the break you mention in 2, but didn't do anything about point 1. In any case, +1 to your patch. I'll rebase if someone decides to commit it first. Thanks, Amit [1] https://www.postgresql.org/message-id/a5df1cf6-dc51-1720-2abe-7957502b2cf9%40lab.ntt.co.jp -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
[HACKERS] fix possible optimizations in ATExecAttachPartition()
Hi, I was doing some testing for my default partitioning work, and I realized that there seem to be a some optimization possible (and I think we should really have this optimization) for logic around handling the "key IS NOT NULL" constraints followed by predicate_implied_by() call. 1. Consider, if predicate_implied_by() returns false, in that case skip_validate is left set to false, and we really do not want to do lots of stuff followed this decision just to prove that the scan cannot be avoided(which is already decided in this case) if there is no NOT NULL constraint on the partition key column. 2. Further, if we have already decided not to skip the scan, we should really have a break in following if block: if (!partition_accepts_null && (partattno == 0 || !bms_is_member(partattno, not_null_attrs))) skip_validate = false; I have made above changes in the attached patch. PFA, and let me know if I am missing something here. Regards, Jeevan Ladhe fix_atexecattahpartition.patch Description: Binary data -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers