How are you able to build Calcite? I'm testing commit a54c3a85e586a676a61ec3b2e2586512bac8620a [maven-release-plugin] prepare release calcite-1.6.0. I use `mvn clean & mvn install`. It does hang 5 out of 5 times like https://issues.apache.org/jira/browse/CALCITE-1060
Vladimir
