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SAMPLE will return same result every time. #3331

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

SAMPLE will return same result every time. #3331

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

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

Date: 2013-07-31 08:15:36 +0200
From: jun liu <>
To: GDK devs <>
Version: 11.15.15 (Feb2013-SP4)
CC: @hannesmuehleisen

Last updated: 2013-10-22 14:42:11 +0200

Comment 18951

Date: 2013-07-31 08:15:36 +0200
From: jun liu <>

User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4
Build Identifier:

To execute SQL like: "select id from table sample 0.1"

It will return same result set every time, but random result expected.

Reproducible: Always

Comment 18952

Date: 2013-07-31 08:22:08 +0200
From: jun liu <>

example:

sql>select uid from users sample 5;
+------------+
| uid |
+============+
| 1826098154 |
| 1840137980 |
| 1735367250 |
| 1887581187 |
| 1354129612 |
+------------+
5 tuples (3.2s)
sql>select uid from users sample 5;
+------------+
| uid |
+============+
| 1826098154 |
| 1840137980 |
| 1735367250 |
| 1887581187 |
| 1354129612 |
+------------+
5 tuples (3.3s)

Comment 19204

Date: 2013-09-27 16:41:25 +0200
From: MonetDB Mercurial Repository <>

Changeset 2bccc8cfa356 made by Sjoerd Mullender sjoerd@acm.org in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=2bccc8cfa356

Changeset description:

Reverse order of mar_tail and reverse.
This fixes bug #3331.
This should not be propagated.
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