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From "Chao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-8233) multi-table insertion doesn't work with ForwardOperator [Spark Branch]
Date Thu, 16 Oct 2014 23:10:34 GMT

     [ https://issues.apache.org/jira/browse/HIVE-8233?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chao updated HIVE-8233:
-----------------------
    Resolution: Won't Fix
        Status: Resolved  (was: Patch Available)

> multi-table insertion doesn't work with ForwardOperator [Spark Branch]
> ----------------------------------------------------------------------
>
>                 Key: HIVE-8233
>                 URL: https://issues.apache.org/jira/browse/HIVE-8233
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>            Reporter: Chao
>            Assignee: Chao
>         Attachments: HIVE-8233.1-spark.patch, HIVE-8233.2-spark.patch, HIVE-8233.3-spark.patch,
HIVE-8233.4-spark.patch, HIVE-8233.5-spark.patch
>
>
> Right now, for multi-table insertion, we will start from multiple FileSinkOperators,
and break from their lowest common ancestor, adding temporary FileSinkOperator and TableScanOperators.
A special case is when the LCA is a ForwardOperator, in which case we don't break it, since
it's already been optimized.
> However, there's a issue, considering the following plan:
> {noformat}
>       ...
>       RS_0
>        |
>       FOR
>        |
>      /   \
>    GBY_1  GBY_2
>     |     |
>    ...   ...
>     |     |
>    RS_1  RS_2
>     |     |
>    ...   ...
>     |     |
>    FS_1  FS_2
> {noformat}
> which may result to:
> {noformat}
>           RW
>          /  \
>        RW    RW
> {noformat}
> Hence, because of the issue in HIVE-7731 and HIVE-8118, both downstream branches will
get duplicated (and same) input.



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