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IMPALA-3002: The shell prints an incorrect value for '#Rows' in the exec summary for broadcast nodes due to incorrect logic around whether to use max or agg stats. This patch makes the behavior consistent with the way the be treats exec summaries in summary-util.cc. This incorrect logic was also duplicated in the impala_beeswax test framework. IMPALA-1473: When there is a merging exchange with a limit, we may copy rows into the output batch beyond the limit. In this case, we currently update the output batch's size to reflect the limit, but we also need to update ExecNode::num_rows_returned_ or the exec summary may show that the exchange node returned more rows than it really did. Additionally, PlanFragmentExecutor::GetNext does not update rows_produced_counter_ in some cases, leading the runtime profile to display an incorrect value for 'RowsProduced'. Change-Id: I386719370386c9cff09b8b35d15dc712dc6480aa Reviewed-on: http://gerrit.cloudera.org:8080/4679 Reviewed-by: Matthew Jacobs <mj@cloudera.com> Tested-by: Internal Jenkins