>>> df = session.create_dataframe(["a", "b"], schema=["col"]).select(sha2("col", 256))
>>> df.collect()
[Row(SHA2("COL", 256)='ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb'), Row(SHA2("COL", 256)='3e23e8160039594a33894f6564e1b1348bbd7a0088d42c4acb73eeaed59c009d')]