[jira] [Created] (CALCITE-1080) Cassandra adapter

["Michael Mior (JIRA)" <ji...@apache.org>]

Michael Mior created CALCITE-1080:
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             Summary: Cassandra adapter
                 Key: CALCITE-1080
                 URL: https://issues.apache.org/jira/browse/CALCITE-1080
             Project: Calcite
          Issue Type: New Feature
            Reporter: Michael Mior
            Assignee: Julian Hyde


I've started work on an adapter for [Apache Cassandra|https://cassandra.apache.org/].

There's still a fair bit of work to do, but you can successfully issue a fairly broad class of queries with filtering, sorting, and projections pushed down to Cassandra in many cases.

Progress can be tracked on [GitHub|https://github.com/michaelmior/calcite/tree/cassandra]. Below is a brief list of things which still need to be done. I'm hoping this can be useful to others, so it would be good to get a sense of what would be considered complete for future release.

*To do*
* New tests for test suite (and update [calcite-test-dataset|https://github.com/vlsi/calcite-test-dataset] to support Cassandra)
* Allow for partial application of filter predicates (since Cassandra's query language is so limited, this will avoid the case where only trivial predicates can be pushed down)
* Allow for partial sorting (for the same reason as above)
* Proper quoting of identifiers
* Fix projections to avoid projecting unnecessary columns in some circumstances
* Proper cost modelling



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