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https://issues.apache.org/jira/browse/LUCENE-4883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614316#comment-13614316
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Alan Woodward commented on LUCENE-4883:
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bq. I think it needs to take this information up-front: a mapping of field
names from the underlying fieldinfos to docvalues types
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. Otherwise
you're restricted to just the fields in the map, but you know you're not going
to uninvert the wrong type. Applications like Solr or ES can manage the types
outside of UFR using their own field type information.
bq. How can we expose "missing" for NumericDocValues
I was going to move the FieldCache#getDocsWithField() method to AtomicReader,
but I see that this doesn't actually work in the same way with DocValues at the
moment.
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
:-)
> 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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