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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11234) CBO: Calcite Operator To Hive Operator (Calcite Return Path): reconsider the cross product in HiveJoinToMultiJoinRule
Date Mon, 13 Jul 2015 03:57:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pengcheng Xiong updated HIVE-11234:
-----------------------------------
    Attachment: HIVE-11234.01.patch

The attached patch is only a workaround, may not be the best solution: we do not do the multi-join
conversion when there is any cross product.

> CBO: Calcite Operator To Hive Operator (Calcite Return Path): reconsider the cross product
in HiveJoinToMultiJoinRule
> ---------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-11234
>                 URL: https://issues.apache.org/jira/browse/HIVE-11234
>             Project: Hive
>          Issue Type: Sub-task
>          Components: CBO
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-11234.01.patch
>
>
> Cross product in HiveJoinToMultiJoinRule needs to be reconsidered. Now the following
explain query will fail at L1116 StatsRulesProcFactory : FAILED: IndexOutOfBoundsException
Index: 0, Size: 0 because the key in one of the branches of the join is empty.
> {code}
> explain select *  from src 
> where src.key not in (select key  from src1);
> {code}
> If we run
> {code}
> select *  from src 
> where src.key not in (select key  from src1);
> {code}
> we will have "FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask".
The root cause is the same. Other queries that will also fail include cbo_subq_not_in.q etc.



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