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https://issues.apache.org/jira/browse/FLINK-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15433696#comment-15433696
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Neelesh Srinivas Salian commented on FLINK-4148:
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[~humanoid], thank you for reporting this. Could you please create a Pull
Request for the same patch?
> incorrect calculation distance in QuadTree
> ------------------------------------------
>
> Key: FLINK-4148
> URL: https://issues.apache.org/jira/browse/FLINK-4148
> Project: Flink
> Issue Type: Bug
> Reporter: Alexey Diomin
> Priority: Trivial
> Attachments:
> 0001-FLINK-4148-incorrect-calculation-minDist-distance-in.patch
>
>
> https://github.com/apache/flink/blob/master/flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/nn/QuadTree.scala#L105
> Because EuclideanDistanceMetric extends SquaredEuclideanDistanceMetric we
> always move in first case and never reach case for math.sqrt(minDist)
> correct match first EuclideanDistanceMetric and after it
> SquaredEuclideanDistanceMetric
> p.s. because EuclideanDistanceMetric more compute expensive and stay as
> default DistanceMetric it's can cause some performance degradation for KNN on
> default parameters
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