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      Update:

      Index intersection is on by default. The query planner currently limits itself to 2 indices at a time, though this limit may increase in the future.

      Original Text:

      This should support both single and multiple index intersections.

      This should support queries that which want to use a covered index; then complex intersections would never need to hit the document to return the values.

      A more detailed description of index intersection in a traditional RDMS can be found here:

      http://www.sql-server-performance.com/2003/index-intersection/

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