Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/6339#issuecomment-124293893
This will be very useful. For the design, I don't think it actually needs
to be linked to StringIndexer at all since everything it needs is stored in the
metadata (by StringIndexer). It should be able to take an input column of type
Double (or other numerics too?), look at the metadata for a mapping, and
convert the column to the corresponding string labels.
It could still be called InverseStringIndexer for clarity, though.
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