Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Division by zero in CASE statement that should avoid it #3546

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

Division by zero in CASE statement that should avoid it #3546

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

Comments

@monetdb-team
Copy link

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

Date: 2014-08-19 15:30:19 +0200
From: @hannesmuehleisen
To: SQL devs <>
Version: 11.17.13 (Jan2014-SP1)
CC: @njnes

Last updated: 2014-10-31 14:14:59 +0100

Comment 20056

Date: 2014-08-19 15:30:19 +0200
From: @hannesmuehleisen

User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.0 Safari/537.36
Build Identifier:

Run the following statements

create table t(r integer,a integer);
insert into t values (1,2),(2,0),(3,null);
select case when not (a is null) and a > 0.0 then r/a else -1 end as s from t;

Reproducible: Always

Actual Results:

Error message 'division by zero.'

Expected Results:

Result should be returned.

Also happens in the Oct2014 branch.

Weirdly,

select case when not (a is null) and a > 0.0 then r/a else -1 end as s from t;

works fine.

Comment 20057

Date: 2014-08-19 15:32:01 +0200
From: MonetDB Mercurial Repository <>

Changeset 2a4c32b79774 made by Hannes Muehleisen hannes@cwi.nl in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=2a4c32b79774

Changeset description:

Test for Bug #3546 and mc R connector

Comment 20058

Date: 2014-08-19 15:33:07 +0200
From: @hannesmuehleisen

Correction, the breaking query is

select case when not (a is null) and a > 0.0 then 1.0*r/a else -1 end as r from t;

Comment 20062

Date: 2014-08-20 10:57:11 +0200
From: MonetDB Mercurial Repository <>

Changeset 9698a5f83bf6 made by Niels Nes niels@cwi.nl in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=9698a5f83bf6

Changeset description:

generalized div detection/rewrites which fixes bug #3546

Comment 20102

Date: 2014-08-28 23:33:45 +0200
From: MonetDB Mercurial Repository <>

Changeset 440f4e5a5586 made by Stefan Manegold Stefan.Manegold@cwi.nl in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=440f4e5a5586

Changeset description:

ifthenelse.Bug-3546 & round.Bug-3542: approved int128 output

Comment 20400

Date: 2014-10-31 14:14:59 +0100
From: @sjoerdmullender

Oct2014 has been released.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Projects
None yet
Linked pull requests

Successfully merging a pull request may close this issue.

None yet
1 participant