Mongo and Cassandra connectors

[daddydrac]

REQUEST: Ability to connect Superset to Mongo and Cassandra to run queries against it.
Apache Drill can connect to Mongo and Big Query can connect to Cassandra, so it's def possible.

There is Flask Mongo Alchemy - https://pythonhosted.org/Flask-MongoAlchemy/
SQLAlchemy can connect to Cassandra, apparently - https://www.cdata.com/kb/tech/cassandra-python-sqlalchemy.rst

How can we get this into Superset, even if we cant use sql syntax, cql is a fine option as well perhaps(?)

[issue-label-bot]

Issue-Label Bot is automatically applying the label #enhancement to this issue, with a confidence of 0.87. Please mark this comment with 👍 or 👎 to give our bot feedback!

Links: app homepage, dashboard and code for this bot.

[mistercrunch]

We'd have to confirm that the implementation works for the type of queries that we run, with .groupby(...), .filter(), and aggregation expressions like SUM and COUNT. My guess is that they've implement an OLTP-like subset of SQL and DML.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. For admin, please label this issue .pinned to prevent stale bot from closing the issue.