While building from the release tarball, unit test fail if you build from a directory that is nested several levels deep such that the full path to some of the test data files is longer than 128 characters.
The limit appears to be very small and should be increased.
One of the errors during the build that illustrates the problem:
testTextJoin(org.apache.drill.TestExampleQueries) Time elapsed: 0.011 sec <<< ERROR!
org.apache.drill.exec.rpc.RpcException: Failure while parsing sql. Length of identifier 'file:/Users/pchandra/work/drill-release/apache-drill-0.6.0-incubating-src/exec/java-exec/target/test-classes/store/text/data/nations.csv' must be less than or equal to 128 characters [38933037-d38d-4278-a215-b722cc97811c]