Github user srowen commented on the issue: https://github.com/apache/spark/pull/16038 If you're right here, then https://github.com/apache/spark/pull/16037 does nothing, right? In which case my understanding at https://github.com/apache/spark/pull/15905#pullrequestreview-8844854 is wrong. But if your other change does work, and that would be explained by my understanding, then this doesn't help. At https://issues.apache.org/jira/browse/SPARK-18471?focusedCommentId=15670795&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15670795 you describe aggregating a dense vector, but this is different from having a dense vector zero value.
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