Selective field loading
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Key: LUCENE-558
URL: http://issues.apache.org/jira/browse/LUCENE-558
Project: Lucene - Java
Type: New Feature
Components: Index
Versions: 2.0
Environment: All
Reporter: Chuck Williams
Provides a new api, IndexReader.document(int doc, String[] fields). A document
containing only the specified fields is created. The other fields of the
document are not loaded, although unfortunately uncompressed strings still have
to be scanned because the length information in the index is for UTF-8 encoded
chars and not bytes. This is useful for applications that need quick access to
a small subset of the fields. It can be used in conjunction with or for some
uses instead of ParallelReader.
This is a much smaller change for a simpler use case than Lucene-545. No
existing API's are affected.
All the tests pass and new tests are added to verify the feature.
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