Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/17090
@jkbradley I've put my updated proposal for ranking evaluation [on
SPARK-14409
comments](https://issues.apache.org/jira/browse/SPARK-14409?focusedCommentId=15896933&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15896933).
It's different from this schema (and from the `mllib` recommend all return
types). I've detailed the reasoning in the JIRA.
I would have preferred a more explicit discussion & decision on the schema
before merging this, but now that it's merged we should at least consider how
(or if) to deal with the schema difference assuming the above proposal proceeds.
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