Re: postgresql 10.1 wrong plan in when using partitions bug

On Sun, Feb 04, 2018 at 05:06:38PM +0200, Mariel Cherkassky wrote:
> Great, it solved the issue. Seems problematic that the planner do full
> scans on all partitions in the first case isnt it ? Seems like a bug ?

See also:
https://www.postgresql.org/message-id/20170725131650.GA30519%40telsasoft.com
https://www.postgresql.org/message-id/20170825154434.GC16287%40telsasoft.com

Justin

2018-02-04 16:54 GMT+02:00 Andreas Kretschmer <andreas@a-kretschmer.de>:
>
> >
> >
Am 04.02.2018 um 13:19 schrieb Mariel Cherkassky:
> >
> >> I checked the plan of the next query :
> >> explain select count(*) from log_full where end_date between
> >> to_date('2017/12/03','YY/MM/DD') and to_date('2017/12/03','YY/MM/DD');
> >>
> >>
> > can you rewrite the query to
> >
> > ... where end_date between '2017/12/03' and '2017/12/03'
> >

> > maybe the planner should be smart enough to do that for you, but obvously
> > he can't. So it's a workaround, but it seems to solve the problem.