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Posted to dev@hive.apache.org by "Pengcheng Xiong (JIRA)" <ji...@apache.org> on 2014/10/31 03:39:33 UTC

[jira] [Created] (HIVE-8681) CBO: Column names are missing from join expression in Map join with CBO enabled

Pengcheng Xiong created HIVE-8681:
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             Summary: CBO: Column names are missing from join expression in Map join with CBO enabled
                 Key: HIVE-8681
                 URL: https://issues.apache.org/jira/browse/HIVE-8681
             Project: Hive
          Issue Type: Improvement
            Reporter: Pengcheng Xiong
            Assignee: Pengcheng Xiong


On Hive 14 when CBO is enabled the column names are missing from the join expression. Rather than to use external names "key", "value", some internal names such as "_col0" or "_col1" are used. For map join with more than two tables it is very hard to figure the actual join order. In this patch, I am going to address this issue not only for join but also for all the other operators. And it will also be addressed in not only CLI but also TEZ environment.



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