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https://issues.apache.org/jira/browse/LUCENE-5618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975174#comment-13975174
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Robert Muir commented on LUCENE-5618:
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I think its a design flaw in how this stuff is written. It only "worked"
because dv reader didn't validate this stuff in init. I'm still unsure if this
should block 4.8 or if its ok to defer to 4.9, but this is really bogus. The
simple solution is for dv update gens to always only have one field.
> DocValues updates send wrong fieldinfos to codec producers
> ----------------------------------------------------------
>
> Key: LUCENE-5618
> URL: https://issues.apache.org/jira/browse/LUCENE-5618
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> Spinoff from LUCENE-5616.
> See the example there, docvalues readers get a fieldinfos, but it doesn't
> contain the correct ones, so they have invalid field numbers at read time.
> This should really be fixed. Maybe a simple solution is to not write
> "batches" of fields in updates but just have only one field per gen?
> This removes many-many relationships and would make things easy to understand.
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