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Teodor Sigaev 33bd250f6c Cube extension kNN support 
Introduce distance operators over cubes:
<#> taxicab distance
<->  euclidean distance
<=> chebyshev distance

Also add kNN support of those distances in GiST opclass.

Author: Stas Kelvich
 		2015-12-18 14:38:27 +03:00
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cube.sql Cube extension kNN support 2015-12-18 14:38:27 +03:00