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From "Rick Hillegas (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-887) Select statement returns wrong number of rows if you compare an integer column with a boolean expression in the where clause
Date Tue, 14 Feb 2006 16:47:42 GMT
     [ http://issues.apache.org/jira/browse/DERBY-887?page=all ]

Rick Hillegas updated DERBY-887:
--------------------------------

    Attachment: bug887_interim.diff

Hi Satheesh,

I have attached my half-baked work on this bug: bug887_interim.diff. If someone else wants
to pick up this JIRA, they may find that patch useful. In particular, the patch contains changes
to various datatype classes which disable the illegal explicit and implicit casts. However,
although the patch fixes the bugs, it breaks some other functionality including some unit
tests. In particular, it breaks the ODBC metadata mapping, which relies on these illegal casts.
My fix to that problem was to add a system function which performs the job formerly done by
the illegal cast.

I have not worked on this for a week and a half and it's clear that I am swamped with other
work. I too would like to see this bug fixed for 10.2 but the reality is, I am not going to
get to it soon. If someone else is itching badly, please go ahead and scratch.

> Select statement returns wrong number of rows if you compare an integer column with a
boolean expression in the where clause
> ----------------------------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-887
>          URL: http://issues.apache.org/jira/browse/DERBY-887
>      Project: Derby
>         Type: Bug
>   Components: SQL
>     Versions: 10.2.0.0
>  Environment: Java : java version "1.5.0_02"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_02-b09)
> Java HotSpot(TM) Client VM (build 1.5.0_02-b09, mixed mode)
> Classpath : c:/pantry/derby.jar;c:/pantry/derbytools.jar;
> OS: Windows XP Professional
>     Reporter: Manjula Kutty
>     Priority: Critical
>      Fix For: 10.2.0.0
>  Attachments: DERBY-887.sql, bug887_interim.diff
>
> I have a table with 2 columns one is BIGINT which is Generated always starting with 1
and increment by1 and the other one is timestamp
>  ij> select id,date from inbox where id = 0<3;
> ID                  |DATE
> -----------------------------------------------
> 25                  |2006-01-26 14:35:46.584
> 34                  |2006-01-26 14:36:16.588
> 21                  |2006-01-26 14:34:46.455
> 22                  |2006-01-26 14:34:47.176
> 27                  |2006-01-26 14:35:47.054
> 24                  |2006-01-26 14:35:16.58
> 28                  |2006-01-26 14:35:47.305
> 35                  |2006-01-26 14:36:18.771
> 31                  |2006-01-26 14:35:48.496
> 32                  |2006-01-26 14:35:48.887
> 33                  |2006-01-26 14:35:49.308
> 11 rows selected
> ij> select id,date from inbox where id = true;
> ID                  |DATE
> -----------------------------------------------
> 21                  |2006-01-26 14:34:46.455
> 1 row selected
> Both queries should return same number of rows
> Also If I delete the first row from the table then select id,date from inbox where id
= true; returns the second row
> ij> delete from inbox where id=21;
> 1 row inserted/updated/deleted
> Then again run
> ij> select id ,date from inbox where id=true;
> ID                  |DATE
> -----------------------------------------------
> 22                 |2006-01-26 14:35:16.58
> Which indicates that the select returns only the first row and then is getting closed

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