Remove norms() support from non-atomic IndexReaders
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Key: LUCENE-2771
URL: https://issues.apache.org/jira/browse/LUCENE-2771
Project: Lucene - Java
Issue Type: Improvement
Reporter: Uwe Schindler
Fix For: 4.0
Spin-off from LUCENE-2769:
Currently all IndexReaders support norms(), but the core of Lucene never uses
it and its even dangerous because of memory usage. We should do the same like
with MultiFields and factor it out and throw UOE on non-atomic readers.
The SlowMultiReaderWrapper can then manage the norms. Also ParallelReader needs
to be fixed.
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