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https://issues.apache.org/jira/browse/LUCENE-1727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12726103#action_12726103
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Yonik Seeley commented on LUCENE-1727:
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bq. just because someone added it to the FAQ doesn't make it so
Of course, I tried to find out when it was added, and it's been there since the
original Apache version.... that's a long time. I guess we do need to treat it
like a guarantee at this point (which we could break in 3.0 if there is a
benefit to doing so).
It's a good reminder to avoid documenting how something works as a guarantee
that it will always work that way.
> 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, 2.4.1
> Reporter: Hoss Man
> Assignee: Michael McCandless
> Fix For: 2.9
>
>
> 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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