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From "Prasanth J (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-7679) JOIN operator should update the column stats when number of rows changes
Date Tue, 12 Aug 2014 17:49:14 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth J updated HIVE-7679:
-----------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 0.13.0)
                   0.14.0
           Status: Resolved  (was: Patch Available)

The failing test ran successfully on my localbox. Patch committed to trunk. Thanks [~hagleitn]
for the review.

> JOIN operator should update the column stats when number of rows changes
> ------------------------------------------------------------------------
>
>                 Key: HIVE-7679
>                 URL: https://issues.apache.org/jira/browse/HIVE-7679
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Processor, Statistics
>    Affects Versions: 0.14.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>            Priority: Minor
>             Fix For: 0.14.0
>
>         Attachments: HIVE-7679.1.patch, HIVE-7679.2.patch, HIVE-7679.3.patch
>
>
> JOIN operator does not update the column stats when the number of rows changes. All other
operators scales up/down the column statistics when the number of rows changes. Same should
be done for JOIN operator as well. Because of this dataSize might become negative as numNulls
can get bigger than numRows (if scaling down of column stats is not done).



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