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grouped quantiles with all null group causes following groups to return null #6218

monetdb-team opened this issue Nov 30, 2020 · 0 comments


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@monetdb-team monetdb-team commented Nov 30, 2020

Date: 2017-02-17 12:41:10 +0100
From: @sjoerdmullender
To: GDK devs <>
Version: 11.25.5 (Dec2016-SP1)

Last updated: 2017-03-03 10:24:14 +0100

Comment 25031

Date: 2017-02-17 12:41:10 +0100
From: @sjoerdmullender

create table x (i int, j int);
copy 8 records into x from stdin;
select quantile(i,0.5),j from x group by j;

this should return a table
1 0
null 1
1 2

but instead returns
1 0
null 1
null 2

Comment 25032

Date: 2017-02-17 12:44:14 +0100
From: MonetDB Mercurial Repository <>

Changeset 519b5572aaa3 made by Sjoerd Mullender in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=519b5572aaa3

Changeset description:

Fix for bug #6218.

Comment 25110

Date: 2017-03-03 10:24:14 +0100
From: @sjoerdmullender

Dec2016-SP2 has been released, incorporating the fix.

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