Major Description
KUDU-2437 introduced the server-side ability to return "split keys" that logically divide a given tablet into key ranges. KUDU-2670 introduced an improvement in the Spark integration's KuduRDD to allow for Spark to use this generate smaller-scoped scan tokens that each scan a chunk of a tablet instead of entire tablets. This decoupled the a table's partitioning scheme from its read concurrency limitations.
It'd be great if we could expose chunked-token-hydration in the C++ client so that Impala can begin generating these chunked tokens and then hydrating them into smaller scanners in its backend.