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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