Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3110#issuecomment-61921813
Yes, the tricky thing is the existed table with field in type of `array`,
the field always be considered as `ArrayType(nullable=true)`, so a `Cast` node
will be inserted when trying to insert a `constant not null array`(which
nullable = false) into it. However, the expression `Cast` doesn't support
complicated data type, that's why exception raised.
One possible change is adding an `equals` method for `ArrayType`, which
ignores the `nullable` for the equality comparison. What do you think?
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