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Date: Fri, 29 Sep 2006 08:40:52 -0700 (PDT)
From: "A B (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-1904) COALESCE with NULL parameter problem
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    [ http://issues.apache.org/jira/browse/DERBY-1904?page=3Dcomments#actio=
n_12438737 ]=20
           =20
A B commented on DERBY-1904:
----------------------------

Do you have a full stack trace for the NullPointerException error that you =
see with ij?  Ex. can you run the above query and then attach the derby.log=
 file to this issue?

I did the simple CREATE TABLE statement and then tried to execute the query=
, but a) the query references a column ITM_NAME that isn't in your table, a=
nd b) when I removed the ITM_NAME from the select list, the queries run wit=
hout error.  So I'm wondering if the problem is specific to your table sche=
ma and/or data.  Can you use the dblook tool to generate the DDL for your I=
TEMS table and then post that, as well?  That is, run

  java org.apache.derby.tools.dblook -d jdbc:derby:<dbname> -t items

and then include the output here.

Having a full stack trace and the full DDL for the table in question might =
make it easier for interested people to investigate this problem more...Tha=
nks!

> COALESCE with NULL parameter problem
> ------------------------------------
>
>                 Key: DERBY-1904
>                 URL: http://issues.apache.org/jira/browse/DERBY-1904
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, SQL
>    Affects Versions: 10.1.3.1
>         Environment: Windows 2000 SP4
> JSTL 1.0.6 on J2EE 1.3
> Tomcat 5.0.28  using a SUN JVM 1.4.2_03
>            Reporter: C=C3=A9dric G=C3=A9rard
>            Priority: Blocker
>
> Hi,
> My  initial objective was to execute this query with  the JSTL sql tag li=
brary  :
>  =20
> SELECT  ID_ITM, ITM_NAME, ITM_CODE
>     FROM  ITEMS
>     WHERE  ITM_CODE =3D COALESCE(?,ITM_CODE)
>  =20
> ITM_CODE is a NUMERIC column, here's the DDL script of the ITEMS  table :
> CREATE  TABLE  ITEMS ( =20
>          ID_ITM                BIGINT NOT  NULL  GENERATED ALWAYS AS  IDE=
NTITY,=20
>          ITM_CODE         NUMERIC  (22) NOT  NULL
>  );
> When ITM_CODE is not set in my application, JSTL bind the parameter as nu=
ll. When ITM_CODE is set, it works.
>  =20
>  I  got this message error :=20
>  : Invalid  data conversion: Parameter object type is invalid for request=
ed conversion.  (Apache
> Derby  release 10.1.3.1 client  driver)
> =3D> We try to use CAST(? AS NUMERIC) in place of ?. We obtain the same e=
rror when NULL is passed.
>  : The  exception 'java.lang.ArrayIndexOutOfBoundsException: -1' was thro=
wn while  evaluating
> an expression. SQLSTATE: XJ001: Java exception: '-1:  java.lang.ArrayInde=
xOutOfBoundsException'.
> (Apache Derby snapshot-10.2.0.4  client driver)
> With ij, we have the same problem (but not the same message)
> ij> SELECT ID_ITM, ITM_NAME, ITM_CODE
>      FROM ITEMS
>      WHERE ITM_CODE =3D COALESCE(NULL,ITM_CODE );
> ERROR 42X01: Syntax error: Encountered "NULL" at line 3, column 31.
> ij> SELECT ID_ITM, ITM_NAME, ITM_CODE
>      FROM ITEMS
>      WHERE ITM_CODE =3D COALESCE(NULLIF(1,1),ITM_CODE );
> ID_ITM              |ITM_NAME                                          |I=
TM_CODE
> -------------------------------------------------------------------------=
-----------------------
> ERROR 38000: The exception 'java.lang.NullPointerException' was thrown wh=
ile evaluating an expression. SQLSTATE: XJ001: Java exception: ': java.lang=
.NullPointerException'.
> ij> SELECT ID_ITM, ITM_NAME, ITM_CODE
>      FROM ITEMS
>      WHERE ITM_CODE =3D COALESCE(CAST(NULLIF(1,1) AS BIGINT), ITM_CODE);
> ID_ITM              |ITM_NAME                                          |I=
TM_CODE
> -------------------------------------------------------------------------=
-----------------------
> ERROR 38000: The exception 'java.lang.NullPointerException' was thrown wh=
ile evaluating an expression. SQLSTATE: XJ001: Java exception: ': java.lang=
.NullPointerException'.
> We have the same errors using 10.2.0.4 snapshot.
> The coalesce function should accept NULL parameter.
> Of course, My sample is very simple and I have n search criteria; so I do=
n't want to create 2^n SQL queries to deal with null or not null criterion.
> I try to replace the coalesce function with a CASE statement but I encoun=
tered the same problems...
> So I don't actually have any workaround.
> Regards,
> C=C3=A9dric

--=20
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