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https://issues.apache.org/jira/browse/CALCITE-1080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15140026#comment-15140026
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Julian Hyde commented on CALCITE-1080:
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[~michaelmior], Fantastic! I have been hoping that someone would do a Cassandra
adapter.
What can I do to help?
I think that adding to calcite-test-dataset is key; it will allow us to start
running regular tests, and will allow people to experiment with the adapter.
[~vlsi] may be able to help with that.
> 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
> * Exploit native aggregation
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