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Fixes inserts into partitioned tables that have a shuffle hint and only constant partition exprs. The rows to be inserted are merged at the coordinator where the table sink is executed. There is no need to hash exchange rows. Now accepts insert hints when inserting into unpartitioned tables. The shuffle hint leads to a plan where all rows are merged at the coordinator where the table sink is executed. Change-Id: I1084d49c95b7d867eeac3297fd2016daff0ab687 Reviewed-on: http://gerrit.cloudera.org:8080/4162 Reviewed-by: Marcel Kornacker <marcel@cloudera.com> Tested-by: Internal Jenkins