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From "Deepak Jaiswal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-20100) OpTraits : Select Optraits should stop when a mismatch is detected
Date Sun, 08 Jul 2018 00:21:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Deepak Jaiswal updated HIVE-20100:
----------------------------------
    Attachment: HIVE-20100.4.patch

> OpTraits : Select Optraits should stop when a mismatch is detected
> ------------------------------------------------------------------
>
>                 Key: HIVE-20100
>                 URL: https://issues.apache.org/jira/browse/HIVE-20100
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>            Priority: Major
>         Attachments: HIVE-20100.1.patch, HIVE-20100.2.patch, HIVE-20100.3.patch, HIVE-20100.4.patch
>
>
> The select operator's optraits logic as stated in the comment is,
> // For bucket columns
> // If all the columns match to the parent, put them in the bucket cols
> // else, add empty list.
> // For sort columns
> // Keep the subset of all the columns as long as order is maintained.
>  
> However, this is not happening due to a bug. The bool found is never reset, so if a single
match is found, the value remains true and allows the optraits get populated with partial
list of columns for bucket col which is incorrect.
> This may lead to creation of SMB join which should not happen.



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