[jira] [Created] (HIVE-20100) OpTraits : Select Optraits should stop when a mismatch is detected

["Deepak Jaiswal (JIRA)" <ji...@apache.org>]

Deepak Jaiswal created HIVE-20100:
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             Summary: 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


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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