fmcquillan99 edited a comment on issue #427: KNN: Add distances to the output table URL: https://github.com/apache/madlib/pull/427#issuecomment-520635936 Suggest we don't take a straight ABS() of the distance function. A negative distance is an error but we don't need to trap it on a point by point basis (too expensive). I will add notes to the user docs that distance function must return >= 0
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