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Allow to specify Oracle-style hint on INSERT/UPSERT statements. For example, - insert /* +noshuffle */ into table functional.alltypes partition(year, month) select * from functional.alltypes; - upsert /* +noshuffle */ into functional_kudu.alltypes select * from functional.alltypes; Testing: Add unit tests to ParserTest#TestPlanHints Add plan check tests to PlannerTest#testInsert, PlannerTest#testKuduUpsert Add tests to ToSqlTest#planHintsTest Change-Id: Ied7629d70197a0270cdc0853e00cc021fdb4dc20 Reviewed-on: http://gerrit.cloudera.org:8080/8676 Reviewed-by: Dimitris Tsirogiannis <dtsirogiannis@cloudera.com> Tested-by: Impala Public Jenkins