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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1727) Order of stored Fields not maintained
Date Wed, 01 Jul 2009 00:40:47 GMT
Order of stored Fields not maintained
-------------------------------------

                 Key: LUCENE-1727
                 URL: https://issues.apache.org/jira/browse/LUCENE-1727
             Project: Lucene - Java
          Issue Type: Bug
          Components: Index
    Affects Versions: 2.4.1, 2.4
            Reporter: Hoss Man


As noted in these threads...

http://www.nabble.com/Order-of-fields-returned-by-Document.getFields%28%29-to21034652.html
http://www.nabble.com/Order-of-fields-within-a-Document-in-Lucene-2.4%2B-to24210597.html

somewhere prior to Lucene 2.4.1 a change was introduced that prevents the Stored fields of
a Document from being returned in same order that they were originally added in.  This can
cause serious performance problems for people attempting to use LoadFirstFieldSelector or
a custom FieldSelector with the LOAD_AND_BREAK, or the SIZE_AND_BREAK options (since the fields
don't come back in the order they expect)

Speculation in the email threads is that the origin of this bug is code introduced by LUCENE-1301
-- but the purpose of that issue was refactoring, so if it really is the cause of the change
this would seem to be a bug, and not a side affect of a conscious implementation change.

Someone who understands indexing internals should investigate this.  At a minimum, if it's
decided that this is not actual a bug, then prior to resolving this bug the wiki docs and
some of the FIeldSelector javadocs should be updated to make it clear what order Fields will
be returned in.



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