Github user dongjoon-hyun commented on the issue: https://github.com/apache/spark/pull/18557 I know that 'there is no usage of this API internally in Spark 2.2', but it's only for 2.2.0. My reason was any 3rd party Spark library cannot use `ColumnVector` for `float` type in Spark 2.2.1+. Anyway, @cloud-fan changes the bug type. If that means backporting is not allowed for this patch, I have no objection for the community decision. So, @kiszk and @cloud-fan . Given that, may I close this PR?
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