Github user danielblazevski commented on the pull request: https://github.com/apache/flink/pull/1220#issuecomment-184847163 Hi @chiwanpark sorry for the delay! I will now have more time to wrap this PR up. I added a check just before calling `knn`: ```scala if (useQuadTree) { if (metric.isInstanceOf[EuclideanDistanceMetric] || metric.isInstanceOf[SquaredEuclideanDistanceMetric]){ knnQueryWithQuadTree(training.values, testing.values, k, metric, queue, out) } else { throw new IllegalArgumentException(s" Error: metric must be" + s" Euclidean or SquaredEuclidean!") } } else { knnQueryBasic(training.values, testing.values, k, metric, queue, out) } } } } ``` Does that work? The commit includes the hint for the cross operation as well.
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