Hi, I created my first JIRA issue: https://issues.apache.org/jira/browse/BEAM-13171
and there is a working implementation commit here (should I create the PR later from this github repo/branch to the master?): https://github.com/virta-ltd/beam/commit/9c18b6aa95b00009ef087aef1274b2b948a61c01 of course, more work for test coverage still needed, but would be nice to have your great feedbacks. Best Regards, Mostafa Aghajani
