Change AtomicReaderContext.leaves() to return itsself as only leave to simplify code and remove
an otherwise unneeded ReaderUtil method
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Key: LUCENE-3757
URL: https://issues.apache.org/jira/browse/LUCENE-3757
Project: Lucene - Java
Issue Type: Improvement
Reporter: Uwe Schindler
The documentation of IndexReaderContext.leaves() states that it returns (for convenience)
all leave nodes, if the context is top-level (directly got from IndexReader), otherwise returns
null. This is not correct for AtomicReaderContext, where it returns null always.
To make it consistent, the convenience method should simply return itsself as only leave for
atomic contexts. This makes the utility method ReaderUtil.leaves() obsolete and simplifies
code.
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