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From "Yonik Seeley (JIRA)" <>
Subject [jira] Commented: (LUCENE-1727) Order of stored Fields not maintained
Date Wed, 01 Jul 2009 15:15:47 GMT


Yonik Seeley commented on LUCENE-1727:

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:
>             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...
> 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
> 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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