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https://issues.apache.org/jira/browse/LUCENE-1749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738140#action_12738140
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Yonik Seeley commented on LUCENE-1749:
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bq. It's interesting that we didn't (I think?) have a similar problem w/ scorer
when we switched to passing it the sub-reader.
Right - that code was well tested and exercised via MultiSearcher in the past
(all idf values had to come from Weight to avoid getting idfs per sub-searcher).
One thing that's missing for explain() is that there is no way to get "df" as
opposed to "idf" from the Weight.
bq. So the only odd thing is why explain is part of Scorer base class
Right.. it doesn't belong there. Perhaps deprecate and remove from the Scorer
base in 3.0? (since one can't reliably call it now 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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