Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop

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От
Andres Freund
Тема
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop
Дата
Msg-id
20171128181459.d4pqmum2tjtrdwdd@alap3.anarazel.de
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BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infiniteloop tcook@blackducksoftware.com
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Thomas Munro <thomas.munro@enterprisedb.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Greg Stark <stark@mit.edu>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Stephen Frost <sfrost@snowman.net>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Andres Freund <andres@anarazel.de>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Thomas Munro <thomas.munro@enterprisedb.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop Tomas Vondra <tomas.vondra@2ndquadrant.com>
Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in aninfinite loop "Todd A. Cook" <tcook@blackducksoftware.com>
Re: BUG #14891: Old cancel request presented by pgbouncer honoredafter skipping a query. Skarsol <postgresql@skarsol.com>
On 2017-11-28 09:55:13 -0500, Todd A. Cook wrote:
> On 11/27/17 23:03, Tom Lane wrote:
> > 
> > Note that the sample data has a lot of collisions:
> > 
> > regression=# select hashint8(val), count(*) from reproducer group by 1 order by 2 desc;
> >    hashint8   | count
> > -------------+-------
> >     441526644 |  2337
> >   -1117776826 |  1221
> >   -1202007016 |   935
> >   -2068831050 |   620
> >    1156644653 |   538
> >     553783815 |   510
> >     259780770 |   444
> >     371047036 |   394
> >     915722575 |   359
> >   ... etc etc ...
> 
> In case it matters, the complete data set will have some outlier values with 10k to 100k
> collisions in this column.

To make sure we're on the same page, this is data intentionally created
to have a lot of hash collisions, is that right?

Greetings,

Andres Freund

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