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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21385) Allow disabling pushdown of non-splittable computation to JDBC sources
Date Wed, 06 Mar 2019 06:25:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16785264#comment-16785264
] 

Daniel Dai commented on HIVE-21385:
-----------------------------------

I think we do want to disable join as it will explode data exponentially. However, aggregation/sort/union
might be ok. How do you think?

> Allow disabling pushdown of non-splittable computation to JDBC sources
> ----------------------------------------------------------------------
>
>                 Key: HIVE-21385
>                 URL: https://issues.apache.org/jira/browse/HIVE-21385
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO, StorageHandler
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>         Attachments: HIVE-21385.01.patch, HIVE-21385.patch
>
>
> Until pushdown is cost-based decision, we will be able to enable / disable pushdown of
operators that prevent reading results from the JDBC connection in parallel.



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