has_table does not check the existence of volatile tables

[Similacrest]

engine.execute('CREATE VOLATILE TABLE test(id BIGINT) UNIQUE PRIMARY INDEX (id) ON COMMIT PRESERVE ROWS;')

engine.has_table('test')

False

Maybe check

HELP VOLATILE TABLE

too?

[sandan]

@ShareDVI has_table currently looks at TableKinds in teradatasqlalchemy:
O - non-partitioned tables
T - partitioned tables
V - views

The Teradata SQLEngine doesn't keep volatile tables in the data dictionary since it is non-persistent. Perhaps we can add a has_volatile_table to the dialect?

Also, be aware that teradatasqlalchemy will be succeeding sqlalchemy-teradata as the primary dialect. Any changes will be pushed to teradatasqlalchemy.