Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/1889#issuecomment-52019410
I noticed that currently Parquet support can't handle `MapType` containing
`null` value.
There is a following difference, though:
- writing and reading of `ArrayType` throw exception when `containsNull` is
`true` even if no `null` value is contained.
- writing and reading of `MapType` can do if the map doesn't have `null`
value regardless of `valueContainsNull`.
Should I modify Parquet support to handle `ArrayType` as the same as
`MapType`, i.e. do writing and reading regardless of `containsNull` for now?
(if contains `null` values, it throws runtime exception.)
And handling `null` value for both `ArrayType` and `MapType` would be the
next issue?
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