Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/965#issuecomment-192067428
In newly added tests, the same queries of our existing tests on union are
executed, which means the queries of our union tests are executed twice for
query result validation and result stat validation. I think it will be better
to verify both query result and result stat together.
It is simple if you get the query id of executed test query. You can get
the query id from ResultSet which is actually the TajoResultSetBase. Once you
get the query id, you can get TableDesc of the query result which includes the
stat information. Here is an example.
```
ResultSet res = executeQuery();
QueryId qid = ((TajoResultSetBase)res).getQueryId();
QueryInfo queryInfo =
testingCluster.getMaster().getContext().getQueryJobManager().getFinishedQuery(qid);
TableDesc desc = queryInfo.getResultDesc();
System.out.println(desc.getStats().getNumRows());
```
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