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https://issues.apache.org/jira/browse/LUCENE-1749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739089#action_12739089
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Yonik Seeley commented on LUCENE-1749:
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{quote}
How about, for queries that need to go and look up docFreq, their QueryWeight
impls simply hold onto the [top-level] IndexSearcher that
had been passed to their ctor, and then do the docFreq call against
that, if explain is invoked?
{quote}
Asking the searcher for the docFreq is the right thing to do... but people who
rely on Weight being serializable might be in for a nasty surprise.
Of course... one might wonder if we should bother supporting serializable in
Lucene longer term at all - anyone dealing with distributed systems has found
it to have too many shortcomings anyway.
> FieldCache introspection API
> ----------------------------
>
> Key: LUCENE-1749
> URL: https://issues.apache.org/jira/browse/LUCENE-1749
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Hoss Man
> Priority: Minor
> Fix For: 2.9
>
> Attachments: fieldcache-introspection.patch,
> LUCENE-1749-hossfork.patch, LUCENE-1749.patch, LUCENE-1749.patch,
> LUCENE-1749.patch, LUCENE-1749.patch, LUCENE-1749.patch, LUCENE-1749.patch,
> LUCENE-1749.patch, LUCENE-1749.patch, LUCENE-1749.patch, LUCENE-1749.patch
>
>
> FieldCache should expose an Expert level API for runtime introspection of the
> FieldCache to provide info about what is in the FieldCache at any given
> moment. We should also provide utility methods for sanity checking that the
> FieldCache doesn't contain anything "odd"...
> * entries for the same reader/field with different types/parsers
> * entries for the same field/type/parser in a reader and it's subreader(s)
> * etc...
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