[FLINK-3615] Add support for non-native SQL types

[Alexander Chermenin]

Hi all.

Is FLINK-3615 <https://issues.apache.org/jira/browse/FLINK-3615> an actual
issue now? Or it has been solved in FLINK-3916
<https://issues.apache.org/jira/browse/FLINK-3916>?

Regards,
Alex