Minor Description
https://github.com/apache/spark/commit/d6632d185e147fcbe6724545488ad80dce20277e added an useful util
@contextmanager
def sql_conf(self, pairs):
...
to allow configuration set/unset within a block:
with self.sql_conf({"spark.blah.blah.blah", "blah"})
# test codes
It would be nicer if we use it.
Note that there look already few places affecting tests without restoring the original value back in unittest classes.
