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Date: Tue, 1 Mar 2011 15:43:37 +0000 (UTC)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] Updated: (LUCENE-2944) BytesRef reuse bugs in QueryParser
 and analysis.jsp
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     [ https://issues.apache.org/jira/browse/LUCENE-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-2944:
--------------------------------

    Attachment: LUCENE-2944_option2.patch

here's the alternative patch, also adding documentation that you *must* make a new copy of the byte[] for each term.

> BytesRef reuse bugs in QueryParser and analysis.jsp
> ---------------------------------------------------
>
>                 Key: LUCENE-2944
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2944
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>             Fix For: 4.0
>
>         Attachments: LUCENE-2944.patch, LUCENE-2944.patch, LUCENE-2944_option2.patch
>
>
> Some code uses BytesRef as if it were a "String", in this case consumers of TermToBytesRefAttribute.
> The thing is, while our general implementation works on char[] and then populates the consumers BytesRef,
> not all TermToBytesRefAttribute implementations do this, specifically ICU collation, it reuses the bytes and simply sets the pointers:
> {noformat}
>   @Override
>   public int toBytesRef(BytesRef target) {
>     collator.getRawCollationKey(toString(), key);
>     target.bytes = key.bytes;
>     target.offset = 0;
>     target.length = key.size;
>     return target.hashCode();
>   }
> {noformat}
> Most of the blame falls on me as I added this to the queryparser in LUCENE-2514.
> Attached is a patch so that these consumers re-use a 'spare' and copy the bytes when they are going to make a long lasting object such as a Term.

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