Hello, hackers. Here is the patch that introduces kNN search for cubes with euclidean, taxicab and chebyshev distances.
Following distance operators introduced: <#> taxicab distance <-> euclidean distance <=> chebyshev distance For example: SELECT * FROM objects ORDER BY objects.coord <-> '(137,42,314)'::cube LIMIT 10; Also there is operator "->" for selecting ordered rows directly from index. This request selects rows ordered ascending by 3rd coordinate: SELECT * FROM objects ORDER BY objects.coord->3 LIMIT 10; For descendent ordering suggested syntax with minus before coordinate. This request selects rows ordered descending by 4th coordinate: SELECT * FROM objects ORDER BY objects.coord->-4 LIMIT 10; Stas Kelvich.
distances.patch
Description: Binary data
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