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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-8681) CBO: Column names are missing from join expression in Map join with CBO enabled
Date Tue, 11 Nov 2014 22:33:34 GMT

     [ https://issues.apache.org/jira/browse/HIVE-8681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pengcheng Xiong updated HIVE-8681:
----------------------------------
    Attachment: HIVE-8681.2.patch

address [~jpullokkaran]'s comment
(1) create a new HiveConf HIVE_EXPLAIN_TRANSLATE_COLUMN_NAME("hive.explain.translate.column.name"
to enable the translation. Default is false.
(2) verify with [~mmokhtar] that it works with CLI, Tez with convertjoin = false/true. Add
support for the case when vectorization is used.

> 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
>         Attachments: HIVE-8681.1.patch, HIVE-8681.2.patch
>
>
> 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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