Github user ilganeli commented on the pull request:
https://github.com/apache/spark/pull/6686#issuecomment-110439765
@rxin I reverted to using fromString because the ```DataTypeParser.parse```
does not support ```LongType```. This means it's not a strictly correct
conversion and would actually invalidate a number of existing tests if we were
to use this function instead. The ```parse()``` function I think has a
different purpose. I restored its use within ```DataType.cast()``` but use
```fromString``` elsewhere.
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