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From "Bernt M. Johnsen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2147) LIKE predicate does not accept a pure column reference as righthand operand (gives ERROR 42824)
Date Wed, 06 Dec 2006 11:59:25 GMT
     [ http://issues.apache.org/jira/browse/DERBY-2147?page=all ]

Bernt M. Johnsen updated DERBY-2147:
------------------------------------

    Derby Info: [Patch Available]

> LIKE predicate does not accept a pure column reference as righthand operand (gives ERROR
42824)
> -----------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2147
>                 URL: http://issues.apache.org/jira/browse/DERBY-2147
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.3.0.0
>            Reporter: Ole Solberg
>         Assigned To: Bernt M. Johnsen
>            Priority: Minor
>         Attachments: DERBY-2147.diff, DERBY-2147.stat
>
>
> Given "create table t (v varchar(32));"  the query "select * from t where 'dilldall'
like v; " gives ERROR 42824. 
> The problem is easily bypassed using a cast: "select * from t where 'dilldall' like cast
(v as varchar(32));".
> create table t (v varchar(32));
> insert into t values ('%lda%');
> select * from t where 'dilldall' like v; -- ERROR 42824: An operand of LIKE is not a
string, or the first operand is not a column.
> select * from t where 'dilldall' like cast (v as varchar(32)); -- 1 row. OK
> select * from t where v like 'dilldall'; -- 0 rows - OK, not a pattern as right op.
> select * from t where cast (v as varchar(32)) like 'dilldall';  -- 0 rows - OK, not a
pattern as right op.
> A column reference as a righthand operand should be accepted according to
> ISO/IEC 9075-2:1999 (E):
> 8.5 <like predicate>
> <like predicate> ::= 
>     <character like predicate> | <octet like predicate>
> <character like predicate> ::= 
>     <character match value> [ NOT ] LIKE <character pattern> [ ESCAPE <escape
character> ]
> <character match value> ::= <character value expression>
> <character pattern> ::= <character value expression>
> 6.27 <string value expression>
> <character value expression> ::= <concatenation> | <character factor>
> <character factor> ::= <character primary> [ <collate clause> ]
> <character primary> ::= <value expression primary> | <string value function>
> 6.23 <value expression>
> <value expression primary> ::= <parenthesized value expression> | <nonparenthesized
value expression primary>
> <nonparenthesized value expression primary> ::= <unsigned value specification>
| <column reference> | ....

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