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Proximity queries

  • LIMIT! /3 STATUTE /3 FEDERAL /2 TORT

    • Again, here, /k means “within k words of”.

  • Clearly, positional indexes can be used for such queries; biword indexes cannot.

  • Exercise: Adapt the linear merge of postings to handle proximity queries. Can you make it work for any value of k?

    • This is a little tricky to do correctly and efficiently

    • See Figure 2.12 of IIR

    • There’s likely to be a problem on it!


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