[SQL] Throw UnsupportedOperationException instead of NotImplementedError

NotImplementedError in scala 2.10 is a fatal exception, which is not very nice to throw when not actually fatal.

Author: Michael Armbrust <michael@databricks.com>

Closes #5315 from marmbrus/throwUnsupported and squashes the following commits:

c29e03b [Michael Armbrust] [SQL] Throw UnsupportedOperationException instead of NotImplementedError
052e05b [Michael Armbrust] [SQL] Throw UnsupportedOperationException instead of NotImplementedError