方法：去掉参数SET hive.auto.convert.join=true;
从配置文件$KYLIN_HOME/conf/kylin_hive_conf.xml删掉 或 kylin-gui的cube的“参数覆盖”页上删掉。
其实关于hive.auto.convert.join kylin用的是 SET hive.auto.convert.join.noconditionaltask=true;
解决kylin报错 ClassCastException org.apache.hadoop.hive.ql.exec.ConditionalTask cannot be cast to org.apache.hadoop.hive.ql.exec.mr.MapRedTask
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