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https://issues.apache.org/jira/browse/LUCENE-1761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834730#action_12834730
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Michael McCandless commented on LUCENE-1761:
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I don't think there will be much perf loss. Each dead field will cause a
FieldInfo instance to be created (which is very small).
Norms won't be loaded unless something explicitly asks for them. EG if you do
a search against the dead field, that will create the 1 byte per doc array. If
you do a sort against the dead field, FieldCache will be populated (which is
silly since the values will all be null/0). But if no searching is done
against the fields I believe there's very little cost.
But we really should fix merging to purge fields that don't occur anymore...
> 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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