Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/8984#issuecomment-152069034
I'm concerned with the lack of "reversibility" as in `coltypes(x) <-
coltypes(x)`
Could I propose expanding on your suggestion to return `na` for non-atomic
type?
`coltypes<-()` can skip over `na`
`coltypes()` can have an optional argument default atomic.only = TRUE -
which can be set to FALSE to get `list`, `environment`, `struct` etc for
non-atomic vector types.
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