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From "Bernhard Messer (JIRA)" <j...@apache.org>
Subject [jira] Closed: (LUCENE-306) [PATCH]multiple wildcards ? at the end of search pattern return incorrect hits
Date Mon, 31 Oct 2005 17:10:56 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-306?page=all ]
     
Bernhard Messer closed LUCENE-306:
----------------------------------

    Resolution: Fixed
     Assign To:     (was: Lucene Developers)

WildcardQuery doesn't match 'cat' for queries like 'ca??' anylonger.

> [PATCH]multiple wildcards ? at the end of search pattern return incorrect hits
> ------------------------------------------------------------------------------
>
>          Key: LUCENE-306
>          URL: http://issues.apache.org/jira/browse/LUCENE-306
>      Project: Lucene - Java
>         Type: Bug
>   Components: Search
>     Versions: 1.4
>  Environment: Operating System: other
> Platform: Other
>     Reporter: Xiaozheng Ma

>
> The problem is if you search on "ca??", the hit includes 'cat', 'CA', 
> etc, while the user only wants 4 letter words start with CA, such as 
> 'card', 'cash', to be returned. This happens only when multiple '?' at 
> the end of search pattern. The solution is to check if the word that is 
> matching against search pattern ends while there is still '?' left. If 
> this is the case, match should return false.
> Attached is the patch code I generated use 'diff'
> ********************************************************************
> --- WildcardTermEnum.org	2004-05-11 11:42:10.000000000 -0400
> +++ WildcardTermEnum.java	2004-11-08 14:35:14.823610500 -0500
> @@ -132,6 +132,10 @@
>              }
>              else
>              {
> +	      //to prevent "cat" matches "ca??"
> +	      if(wildchar == WILDCARD_CHAR){
> +		return false;
> +	      }	      
>                // Look at the next character
>                wildcardSearchPos++;
>              }
> **********************************************************************

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