Add next() and skipTo() variants to DocIdSetIterator that return the current
doc, instead of boolean
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Key: LUCENE-1614
URL: https://issues.apache.org/jira/browse/LUCENE-1614
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Reporter: Shai Erera
Fix For: 2.9
See
http://www.nabble.com/Another-possible-optimization---now-in-DocIdSetIterator-p23223319.html
for the full discussion. The basic idea is to add variants to those two
methods that return the current doc they are at, to save successive calls to
doc(). If there are no more docs, return -1. A summary of what was discussed so
far:
# Deprecate those two methods.
# Add nextDoc() and skipToDoc(int) that return doc, with default impl in DISI
(calls next() and skipTo() respectively, and will be changed to abstract in
3.0).
#* I actually would like to propose an alternative to the names: advance() and
advance(int) - the first advances by one, the second advances to target.
# Wherever these are used, do something like '(doc = advance()) >= 0' instead
of comparing to -1 for improved performance.
I will post a patch shortly
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