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Further issues with multiple indexes

  • Collection-wide statistics are hard to maintain

  • E.g., when we spoke of spell-correction: which of several corrected alternatives do we present to the user?

    • We said, pick the one with the most hits

  • How do we maintain the top ones with multiple indexes and invalidation bit vectors?

    • One possibility: ignore everything but the main index for such ordering

  • Will see more such statistics used in results ranking

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