Hierarchical groups

[maciejgrzybek]

There should be a way to define test groups in a hierarchical way. E.g.: hive_tests with two children: long_running and joins

This would allow excluding/choosing tests easier. E.g. super-group of kerberos would be excluded for non-kerberized environments but for those working on kerberos it would be helpful to run a subset of tests, e.g. kerberos-impersonation only.

[akshatnair]

how is it different than just having 2 groups defined in --groups while executing and including all the subgroups when you want everything otherwise just choose the granular ones? It is just specifying all group names in command line versus having a common name right?