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postgres-lambda-diff

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    Allow GiST distance function to return merely a lower-bound.
    Heikki Linnakangas authored 
    The distance function can now set *recheck = false, like index quals. The
executor will then re-check the ORDER BY expressions, and use a queue to
reorder the results on the fly.

This makes it possible to do kNN-searches on polygons and circles, which
don't store the exact value in the index, but just a bounding box.

Alexander Korotkov and me
    35fcb1b3
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    user avatar 35fcb1b3
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