getDocValues should provide a MultiReader DocValues abstraction
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Key: LUCENE-1789
URL: https://issues.apache.org/jira/browse/LUCENE-1789
Project: Lucene - Java
Issue Type: Improvement
Reporter: Hoss Man
Priority: Minor
Fix For: 2.9
When scoring a ValueSourceQuery, the scoring code calls
ValueSource.getValues(reader) on *each* leaf level subreader -- so DocValue
instances are backed by the individual FieldCache entries of the subreaders --
but if Client code were to inadvertently called getValues() on a MultiReader
(or DirectoryReader) they would wind up using the "outer" FieldCache.
Since getValues(IndexReader) returns DocValues, we have an advantage here that
we don't have with FieldCache API (which is required to provide direct array
access). getValues(IndexReader) could be implimented so that *IF* some a caller
inadvertently passes in a reader with non-null subReaders, getValues could
generate a DocValues instance for each of the subReaders, and then wrap them in
a composite "MultiDocValues".
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