db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DERBY-6363) Incorrect evaluation of logical expressions in CASE
Date Mon, 07 Oct 2013 10:49:42 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen resolved DERBY-6363.
---------------------------------------

          Resolution: Fixed
       Fix Version/s: 10.11.0.0
                      10.10.1.3
                      10.9.2.2
                      10.8.3.1
    Issue & fix info:   (was: Patch Available)

> Incorrect evaluation of logical expressions in CASE
> ---------------------------------------------------
>
>                 Key: DERBY-6363
>                 URL: https://issues.apache.org/jira/browse/DERBY-6363
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.4.1.3, 10.8.3.0, 10.10.1.1
>            Reporter: Grzegorz ┼╗ur
>            Assignee: Knut Anders Hatlen
>             Fix For: 10.8.3.1, 10.9.2.2, 10.10.1.3, 10.11.0.0
>
>         Attachments: ac4d3680a5x0141x78ccx0cb1x000006c347101.java, d6363-1a.diff
>
>
> Logical expressions with AND and OR operators inside WHEN inside CASE expression nested
in SELECT part of statement are wrongly evaluated.
> Evaluation results depends on position of OR subexpression. If OR is placed on left side
of AND it is evaluated incorrectly.
> Following code shows the error.
> create table t ( a int, b char );
> insert into t values (1, 'a');
> insert into t values (2, 'b');
> insert into t values (3, 'a');
> insert into t values (4, 'b');
> insert into t values (5, 'a');
> insert into t values (6, 'b');
> select
> a,
> b,
> case
>     when (( b = 'a' or b = 'b' ) and a < 4) then 'x'
>     else '-'
> end,
> case
>     when (a < 4 and ( b = 'a' or b = 'b' )) then 'y'
>     else '-'
> end
> from t;
> Actual result:
> 1 a x y
> 2 b - y
> 3 a x y
> 4 b - -
> 5 a - -
> 6 b - -
> Expected result
> 1 a x y
> 2 b x y
> 3 a x y
> 4 b - -
> 5 a - -
> 6 b - -



--
This message was sent by Atlassian JIRA
(v6.1#6144)

Mime
View raw message