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https://issues.apache.org/jira/browse/SPARK-13610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15828756#comment-15828756
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Joseph K. Bradley commented on SPARK-13610:
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One more: Would these selected subsets of elements be chosen by hand, or would
they need to be chosen automatically via code?
> Create a Transformer to disassemble vectors in DataFrames
> ---------------------------------------------------------
>
> Key: SPARK-13610
> URL: https://issues.apache.org/jira/browse/SPARK-13610
> Project: Spark
> Issue Type: New Feature
> Components: ML, SQL
> Affects Versions: 1.6.0
> Reporter: Andrew MacKinlay
> Priority: Minor
>
> It is possible to convert a standalone numeric field into a single-item
> Vector, using VectorAssembler. However the inverse operation of retrieving a
> single item from a vector and translating it into a field doesn't appear to
> be possible. The workaround I've found is to leave the raw field value in the
> DF, but I have found no other ways to get a field out of a vector (eg to
> perform arithmetic on it). Happy to be proved wrong though. Creating a
> user-defined function doesn't work (in Python at least; it gets a
> pickleexception).This seems like a simple operation which should be supported
> for various use cases.
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