Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/6804#issuecomment-112997875
I know the null checking stuff will make our code more safe, but we usually
don't do that in the API implementation, as it saves lots of redundant of
code, that's almost the general conversion, otherwise we need to make a note in
the scaladoc/javadoc.
Expression framework (including the `UTF8String`) is a quite independent
system to SQL, follow the general API design principles will be OK, and I
believe it's the responsibility for SQLLayer to make the right calls.
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