Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/5731#issuecomment-126534353
Here are some initial thoughts: We should definitely permit users to
specify features with indices and names. Supporting both within the same type
makes the API pretty complex. What if we instead had 1 Param for each way of
selecting columns, where the full set of selected columns will be the union of
each subset (without duplicates)?
2 params:
* ```selectedIndices: IntArrayParam```
* ```selectedNames: StringArrayParam```
E.g.:
* Input Vector col with length 10 and names "col1, col2, ..."
* selectedIndices = 1, 3
* selectedNames = "col1", "col5"
* Output Vector has columns 1, 3, 5
I'll copy this proposal to JIRA.
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