It removes the lines from the output, and it provides two ways to enable it: 1) Configure trace level for the relevant categories. It logs exceptions with stack traces. That possibility was always there.
2) -Dcalcite.debug=true would result in messages printed to the log (this is new) If calcite.debug does not work as a way to tell Calcite to log all the exceptions, I can add new logging category. Then clients could activate that category and get messages. Vladimir
