Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19516
I thought about this, because `ChiSqSelector` only work for categorical
features, after processing it marked features without attributes as
`NominalAttribute` is reasonable, the problem is it do not fill the `values` or
`numValues` members (which are both optional, not required). So I think it
isn't a bug. But maybe you can improve this, to fill `values` or `numValues`
members, by using stats info from `ChiSqSelector`?
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