Is there any way to iterate through a TermEnum backwards? Okay, I know that there isn't a way to do this via the TermEnum class, but is it "implementable" on top of the underlying Lucene datastore?
My particular problem is this:
I have an index of documents, each document has a "date" field (I'm using DateField). Most documents have a different date, so the number of unique dates is close to the number of documents.
I want to find the top N most recent dates, but I don't want to have to iterate through ALL of them first. NB: With DateField, the earlier dates are lexocographically smaller. (I also want to find the most recent N less than some date D).
I know I could "invert" my dates (something like MAX_LONG - date) to get the REVERSE order, but I want to be able to do "least recent" and "most recent".
Is iterating over a TermEnum "impossible", or should I dig further, and possibly submit a patch?
=Matt
PS: my current solution is to do a binary search between MIN and MAX, halving my search space until I find close to N matching documents.
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