expose lastDocId in the posting from the TermEnum API
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Key: LUCENE-1612
URL: https://issues.apache.org/jira/browse/LUCENE-1612
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Affects Versions: 2.4
Reporter: John Wang
We currently have on the TermEnum api: docFreq() which gives the number docs in
the posting.
It would be good to also have the max docid in the posting. That information is
useful when construction a custom DocIdSet, .e.g determine sparseness of the
doc list to decide whether or not to use a BitSet.
I have written a patch to do this, the problem with it is the TermInfosWriter
encodes values in VInt/VLong, there is very little flexibility to add in
lastDocId while making the index backward compatible. (If simple int is used
for say, docFreq, a bit can be used to flag reading of a new piece of
information)
output.writeVInt(ti.docFreq); // write doc freq
output.writeVLong(ti.freqPointer - lastTi.freqPointer); // write pointers
output.writeVLong(ti.proxPointer - lastTi.proxPointer);
Anyway, patch is attached with:TestSegmentTermEnum modified to test this.
TestBackwardsCompatibility fails due to reasons described above.
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