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Remaining problem with sort-based algorithm
Our assumption was: we can keep the dictionary in memory.
We need the dictionary (which grows dynamically) in order to implement a term to termID mapping.
Actually, we could work with term,docID postings instead of termID,docID postings . . .
. . . but then intermediate files become very large. (We would end up with a scalable, but very slow index construction method.)
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