• Re-applied the application name of driver connection SnowflakeConnection to SnowflakeSQLAlchemy.
• SnowflakeDialect.get_columns now throws a NoSuchTableError exception when the specified table doesn't exist, instead of the more vague KeyError.
• Fixed a bug that dialect can not be created with empty host name.
• Fixed a bug that sqlalchemy.func.now is not rendered correctly.