[jira] Commented: (LUCENE-1761) low level Field metadata is never removed from index

["Lance Norskog (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-1761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834567#action_12834567 ] 

Lance Norskog commented on LUCENE-1761:
---------------------------------------

Does this cause any performance cost? 

For example, if the "dead" field had norm vectors, will the norm vector byte-per-document array still be created and maintained?

> low level Field metadata is never removed from index
> ----------------------------------------------------
>
>                 Key: LUCENE-1761
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1761
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.2, 2.3, 2.3.1, 2.3.2, 2.4, 2.4.1
>            Reporter: Hoss Man
>            Priority: Minor
>         Attachments: LUCENE-1761.patch
>
>
> with heterogeneous docs, or an index whose fields evolve over time, field names that are no longer used (ie: all docs that ever referenced them have been deleted) still show up when you use IndexReader.getFieldNames.
> It seems logical that segment merging should only preserve metadata about fields that actually existing the new segment, but even after deleting all documents from an index and optimizing the old field names are still present.

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