TpchTest#testQuery07 timeout when running continuous-integration/appveyor/pr

[JiaTao Tao]

Hi fellows
My PR failed due to, seems an unstable ut, have anyone met this?

FAILURE 300.8sec, org.apache.calcite.adapter.tpch.TpchTest > testQuery07()
    java.util.concurrent.TimeoutException: testQuery07() timed out
after 5 minutes

https://github.com/apache/calcite/pull/2284

https://ci.appveyor.com/project/ApacheSoftwareFoundation/calcite/builds/36616339/job/hblxyoq0myx96d5u

Regards!

Aron Tao