[postgis-devel] Distance operator in presence of M

[Paul Ramsey]

Yes, I’d cry, because then KNN won’t work. You’d have to also figure out how to implement a closest approach model that works on index keys, such that the closest-approach distance between two keys was always less than the same distance between two actual objects. 

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On June 4, 2015 at 10:58:48 AM, Sandro Santilli (strk at keybit.net) wrote:


Would you cry if it did distance at closest-point-of-approach in presence
of M in both operands ? At least it'd be a meaningful one, even if not
necessarely what the user (who can always drop the M from an operand) want.
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