Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/1346#issuecomment-50451426
@yhuai can you describe a little more about the `containsNull` for
`ArrayType` and `MapType`, in my understanding, `Map` and `Array` contains null
in most of cases during the runtime, why not just keep the previous
implementation? Will that be something wrong when producing the RDD schema if
the constraint not added?
Sorry, if I missed some discussion here.
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