Hi All,
What is the best way to achieve the following and what are the differences, if
I say "I do not normalize scores, so I do not need max score tracking, I do not
care if hits are returned in doc id order, or any other order. I need only to
get maxDocs *best scoring* documents":
OPTION 1:
TopDocs top = ixSearcher.search(q, filter, maxDocs);
OPTION 2:
final TopScoreDocCollector tfc = TopScoreDocCollector.create(maxDocs, false);
ixSearcher.search(q, filter, tfc);
TopDocs top = tfc.topDocs();
OPTION 3:
final TopFieldCollector tfc = TopFieldCollector.create(Sort.RELEVANCE,
maxDocs,
false /* fillFields */,
true /* trackDocScores */,
false /* trackMaxScore */,
false /* docsInOrder */);
ixSearcher.search(q.weight(ixSearcher),filter, tfc);
TopDocs top = tfc.topDocs();
what are the pros and cons?
If I read javadoc correctly,
- OPTION 1 tracks max score and delivers doc Ids in order (suboptimal
performance for my case)
- OPTION 2 I do not know abut max score tracking, but doc Ids are not required
to be in order
- OPTION 3 looks like exactly what I want, but one performance comment in
javadoc about Sort.RELEVANCE made me think if that is the fastest way?
What would be recommended here, any other options to achieve the fastest search
with above defined conditions (no max score tracking and doc id order
irrelevant)? OPTIN2 looks nice, but as said, I am not sure about max score
tracking?
Thanks,
eks
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