Ah, aren't MongoDB and JSON both examples of hierarchical datasets? From: Vladimir Sitnikov <[email protected]><mailto:[email protected]> Reply: [email protected] <[email protected]>><mailto:[email protected]> Date: October 8, 2014 at 12:52:53 PM To: [email protected] <[email protected]>><mailto:[email protected]> Subject: Re: Guidance for writing a Calcite adapter for a deep hierarchical dataset
Here's relevant issue: https://issues.apache.org/jira/browse/OPTIQ-207 In two words: unfortunately Calcite's type system does not handle multilevel types and/or recursive data types yet. -- Vladimir
