improvement by Hans-Peter Grahsl: remove underscore union and use pure Javascript to join distinct in node
improvement by Hans-Peter Grahsl: remove underscore union and use pure Javascript to join distinct in node

maggiolo00/nosql-tests,orientechnologies/nosql-tests,orientechnologies/nosql-tests,weinberger/nosql-tests,weinberger/nosql-tests,maggiolo00/nosql-tests