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https://issues.apache.org/jira/browse/LUCENE-5618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975153#comment-13975153
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Michael McCandless commented on LUCENE-5618:
--------------------------------------------
The problem here is we only store the latest gen for a given field, not all
gens that field participated in, so we don't have enough information at
read-time to know when loading gen N all fields that were there.
> 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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