[ http://nagoya.apache.org/jira/browse/DERBY-7?page=comments#action_57096 ]
Jeremy Boynes commented on DERBY-7:
-----------------------------------
The fix seems address the issue with non-CHAR types being used.
However, it exposes a problem with binary comparisons where it is not possible
to compare CHAR and INTEGER types:
ij> values(nullif('1', 1));
ERROR 42818: Comparisons between 'CHAR' and 'INTEGER' are not supported.
ij> values (case when '1' = 1 THEN 2 ELSE 3 END);
ERROR 42818: Comparisons between 'CHAR' and 'INTEGER' are not supported.
I believe though that this is a separate issue affecting all comparisons.
> Bug in NULLIF Function
> ----------------------
>
> Key: DERBY-7
> URL: http://nagoya.apache.org/jira/browse/DERBY-7
> Project: Derby
> Type: Bug
> Components: SQL
> Versions: 10.0.2.0
> Reporter: Tulika Agrawal
> Priority: Minor
>
> Reporting for Christian d'Heureuse, filed on derby-dev list.
> The NULLIF built-in function of Cloudscape 10.0.1.0 beta seems to accept
> only string values.
> Examples:
> values nullif('a','b');
> --> OK
> values nullif(1,2);
> --> Error message: "ERROR 42X89: Types 'CHAR' and
> 'INTEGER' are not type compatible. (Neither type
> is assignable to the other type.)"
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