Unable to create multiple lsh indices each one in its own keyspace - issue #171

[ronassa]

• omitting keyspace when connecting to Cassandra, this will set the default Cassandra keyspace
• when running get_session if the current keyspace is not the same as the configuration we create the keyspace if needed and set it as current.

[ekzhu]

Thanks for the pull request! What happens if a keyspace A is already present, and a connection was created to uses keyspace B, but later another one was created to use A again? Is creating keyspace idempotent?

[ronassa]

yes. if you try to create a keyspace that exists it will skip.

datasketch/datasketch/storage.py

Lines 258 to 261 in 641fb79

	QUERY_CREATE_KEYSPACE = """
	CREATE KEYSPACE IF NOT EXISTS {keyspace}
	WITH replication = {replication}
	"""