Changes for TrieRange in FilteredTermEnum and MultiTermQuery improvement
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Key: LUCENE-1603
URL: https://issues.apache.org/jira/browse/LUCENE-1603
Project: Lucene - Java
Issue Type: Improvement
Affects Versions: 2.4, 2.9
Reporter: Uwe Schindler
This is a patch, that is needed for the MultiTermQuery-rewrite of TrieRange
(LUCENE-1602):
- Make the private members protected, to have access to them from the very
special TrieRangeTermEnum
- Fix a small inconsistency (docFreq() now only returns a value, if a valid
term is existing)
- Improvement of MultiTermFilter.getDocIdSet to return DocIdSet.EMPTY_DOCIDSET,
if the TermEnum is empty (less memory usage) and faster.
- Add the getLastNumberOfTerms() to MultiTermQuery for statistics on different
multi term queries and how may terms they affect, using this new functionality,
the improvement of TrieRange can be shown (extract from test case there, 10000
docs index, long values):
{code}
[junit] Average number of terms during random search on 'field8':
[junit] Trie query: 244.2
[junit] Classical query: 3136.94
[junit] Average number of terms during random search on 'field4':
[junit] Trie query: 38.3
[junit] Classical query: 3018.68
[junit] Average number of terms during random search on 'field2':
[junit] Trie query: 18.04
[junit] Classical query: 3539.42
{code}
All core tests pass.
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