Features

• add support for transaction statistics (#849) (7f7b1a8)
• make the same Table* instances equal to each other (#867) (c1a3d44)
• retry failed query jobs in result() (#837) (519d99c)
• support ScalarQueryParameterType for type_ argument in ScalarQueryParameter constructor (#850) (93d15e2)

Bug Fixes

• make unicode characters working well in load_table_from_json (#865) (ad9c802)