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https://issues.apache.org/jira/browse/LUCENE-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-4087:
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Attachment: LUCENE-4087.patch
here is a new patch adding documentation to DocValues.java & a reference to all
DV Fields. I added a bunch of tests including verification test that changing
norms types actually fails. I extended the type promoter a little to actually
promote INT_16 & INT_8 to Float32 if needed as well as INT_32 to FLOAT_64.
I think its ready
> Provide consistent IW behavior for illegal meta data changes
> ------------------------------------------------------------
>
> Key: LUCENE-4087
> URL: https://issues.apache.org/jira/browse/LUCENE-4087
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Fix For: 4.0, 4.1, 5.0
>
> Attachments: LUCENE-4087.patch, LUCENE-4087.patch
>
>
> Currently IW fails late and inconsistent if field metadata like an already
> defined DocValues type or "un"-omitting norms.
> we can approach this similar to how we handle consistent field number and:
>
> * throw exception if indexOptions conflict (e.g. omitTF=true versus
> false) instead of silently dropping positions on merge
> * same with omitNorms
> * same with norms types and docvalues types
> * still keeping field numbers consistent
> this way we could eliminate all these traps and just give an
> exception instead.
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