Is there a Flink DataSet equivalent to Spark's RDD.persist?

erformance improvement over no caching at all, it doesn't match the performance I get with RDD.persist in Spark. Thanks, Frank Grimes

Why don't Tuple types implement Comparable?

types with the JOOL ones but they caused a StackOverflowError similar to this one:https://issues.apache.org/jira/browse/FLINK-3922 Thanks, Frank Grimes