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https://issues.apache.org/jira/browse/LUCENE-1749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737984#action_12737984
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Mark Miller commented on LUCENE-1749:
-------------------------------------
bq. I was a bit hazy on explain, so for some reason I had it in my head that
you would have to combine the explanations from multiple subreaders
bq. but it would probably break more than it helped right now (by exposing more
limitations) - for example idf in TermWeight.explain()
To be a little more clear - this was originally why I went the direction I did
- I assumed the reader was being used for stats that needed to come from the
top level reader. Gut reaction seeing it go into scorer. I hadn't really
checked that, at least for these queries, that wasn't the case - they just use
it for the filter/fieldcache.
> 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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