ParallelReader should support getSequentialSubReaders if possible
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Key: LUCENE-2766
URL: https://issues.apache.org/jira/browse/LUCENE-2766
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Reporter: Andrzej Bialecki
Applications that need to use ParallelReader can't currently use per-segment
optimizations because getSequentialSubReaders returns null.
Considering the strict requirements on input indexes that ParallelReader
already enforces it's usually the case that the additional indexes are built
with the knowledge of the primary index, in order to keep the docId-s
synchronized. If that's the case then it's conceivable that these indexes could
be created with the same number of segments, which in turn would mean that
their docId-s are synchronized on a per-segment level. ParallelReader should
detect such cases, and in getSequentialSubReader it should return an array of
ParallelReader-s created from corresponding segments of input indexes.
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