I have a custom TopDocsCollector and need to collect a payload from each final
document hit. The payload comes from a single term in each hit.
When collecting the payload, I don't want to fetch the payload during the
collect() method as it will make fetches which may subsequently be bumped from
the topDocs, so I want to fetch it during the topDocs() call.
I made some performance tests on a simple index of 5M documents. If I do
reader.termPositions(term);
termPositions.skipTo(scoreDoc.doc);
it takes up to 282 ms just to make the skipTo.
The javadocs imply that skipTo() can only go forwards and as scoreDocs is in
score order, not docId order, I suppose it's not possible to just use
termPositions.skipTo(scoreDoc.doc);
unless skipTo() can go both backwards. Can it? Javadocs imply there is more
than one type of implementation.
If not I suppose I must resort the scoreDocs by docId order and then loop with
termPositions.skipTo(scoreDoc.doc). The number of hits will be typically small
so it'll be fast enough.
Antony
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