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This is the basis for a working Cassandra adapter for Calcite. There's still a lot to be done, but the basics are working. Currently there are rules for filtering, sorting, and projections. There are some basic integration tests written which test each of these. The tests use a fork of calcite-test-dataset which would presumably be merged along with this work when the time comes. Tests can be run the same as with MongoDB.
I'd love to get some early feedback and see what it will take to get this merged so others can start playing with it.
https://issues.apache.org/jira/browse/CALCITE-1080