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https://issues.apache.org/jira/browse/LUCENE-4883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615097#comment-13615097
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Robert Muir commented on LUCENE-4883:
-------------------------------------
{quote}
I was wondering about how to do this. We could add an optional Map<String,
DocValuesType> parameter to the UFR constructor - if it's absent, then you can
uninvert any field you like, at the risk of fieldcache-insanity.
{quote}
Why allow this? I don't think we should do this. it also prevents it from
working with anything that checks fieldinfos.
{quote}
Maybe for the moment we should just get FieldCache moved into UFR and worry
about passing CheckIndex in another issue? Unless you think that we'll end up
having to make major changes if we don't build this in from the beginning. I'm
new to a lot of this part of the codebase, so all advice is very welcome here
{quote}
I think its a pretty big deal that a filterreader pass checkindex, otherwise
its corrupt, and will behave in a corrupt way. there is also nothing to prevent
someone from calling IW.addIndexes(IR) with it and making a truly corrupt index.
I'm willing to budge on this though, if we want to add this filterreader that
doesnt pass checkindex, its ok to me as long as IndexWriter.addIndexes itself
internally calls checkIndex on the incoming filterreader to prevent corruption.
> Hide FieldCache behind an UninvertingFilterReader
> -------------------------------------------------
>
> Key: LUCENE-4883
> URL: https://issues.apache.org/jira/browse/LUCENE-4883
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Minor
> Attachments: LUCENE-4883.patch
>
>
> From a discussion on the mailing list:
> {{
> rmuir:
> I think instead FieldCache should actually be completely package
> private and hidden behind a UninvertingFilterReader and accessible via
> the existing AtomicReader docValues methods.
> }}
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