Github user snaga commented on the issue:
https://github.com/apache/incubator-madlib/pull/93
Thanks for the review.
> If we would like to support svec, I would suggest we would need to change
the array_output param from BOOLEAN to multi-valued (no array, array, svec) to
support the intent of this PR.
Yes, it would be better to make array_output for multi-values.
I will try some modification to allow `column` (default), `array` and
`svec` with changing the param name from `array_output` to `output_type`.
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