An additional MR job is introduced since the cardinality of grouping sets is more than hive.new.job.grouping.set.cardinality. This functionality is not supported with distincts. Either set hive.new.job.grouping.set.cardinality to a high number (higher than the number of rows per input row due to grouping sets in the query), or rewrite the query to not use distincts. The number of rows per input row due to grouping sets is 32
如果你的 grouping sets大於等於5個維度，將會報如上的錯誤；解決辦法：
1.在你的hql語句前面加上 set hive.new.job.grouping.set.cardinality=xx;（例如我這里是5個維度，一共32個grouping sets，xx我寫的64 ）
2.可以通過在子查詢中用group by去重，避免在聚合中用到distinct