[GitHub] tajo pull request: TAJO-1793: result row count unmatched for UNION...

[jihoonson <gi...@git.apache.org>]

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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