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https://issues.apache.org/jira/browse/HIVE-20100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534391#comment-16534391
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Jason Dere commented on HIVE-20100:
-----------------------------------
+1
> 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
>
>
> 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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