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https://issues.apache.org/jira/browse/LUCENE-6006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14172641#comment-14172641
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ASF subversion and git services commented on LUCENE-6006:
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Commit 1632133 from [~mikemccand] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1632133 ]
LUCENE-6006: remove unnecessary FieldInfo.normType
> Replace FieldInfo.normsType with FieldInfo.hasNorms boolean
> -----------------------------------------------------------
>
> Key: LUCENE-6006
> URL: https://issues.apache.org/jira/browse/LUCENE-6006
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 5.0, Trunk
>
> Attachments: LUCENE-6006.patch, LUCENE-6006.patch, LUCENE-6006.patch,
> LUCENE-6006.patch, LUCENE-6006.patch
>
>
> I came across this precursor while working on LUCENE-6005:
> I think FieldInfo.normsType can only be null (field did not index
> norms) or DocValuesType.NUMERIC (it did). I'd like to simplify to
> just boolean hasNorms.
> This is a strange boolean, though: in theory it should be derived from
> {{indexed && omitNorms == false}}, but we have it for the exceptions
> case where every document in a segment hit an exception and never
> added norms. I think this is the only reason it exists? (In theory,
> such cases should result in 100% deleted segments, which IW should
> then drop ... but seems dangerous to "rely" on that).
> So I changed the indexing chain to just fill in the default (0) norms
> for all documents in such exceptional cases; this way going forward
> (starting with 5.0 indices) we really don't need this hasNorms. But
> we still need it for pre-5.0 indices...
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