HyukjinKwon edited a comment on issue #26910: [SPARK-30154][ML] PySpark UDF to convert MLlib vectors to dense arrays URL: https://github.com/apache/spark/pull/26910#issuecomment-566937518 I don't think such things happen anyway. The problem is UDF itself as it needs to convert Catalyst type to Scala type and needs to convert it back, which is pretty slow.
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