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https://issues.apache.org/jira/browse/LUCENE-1749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12736750#action_12736750
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Mark Miller commented on LUCENE-1749:
-------------------------------------

bq. And then there is explain - IndexSearcher passes the top level reader to 
the weight explain, and valuesourcequery will get a fieldcache based on that 
reader. I guess that one is a bug.

I don't even know what to do about this one. All I can think is that you pump 
out an explain for each sub reader - but thats pretty unhelpful.

Perhaps the best we can do is javadoc the extra requirements that may be needed 
when you use explain?

> 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.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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