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From "Deepak Jaiswal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16132) DataSize stats don't seem correct in semijoin opt branch
Date Tue, 07 Mar 2017 01:02:33 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Deepak Jaiswal updated HIVE-16132:
----------------------------------
    Status: Patch Available  (was: In Progress)

> DataSize stats don't seem correct in semijoin opt branch
> --------------------------------------------------------
>
>                 Key: HIVE-16132
>                 URL: https://issues.apache.org/jira/browse/HIVE-16132
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>
> For the following operator tree snippet, the second Select is the start of a semijoin
optimization branch. Take a look at the Data size - it is the same as the data size for its
parent Select, even though the second select has only a single bigint column in its projection
(the parent has 2 columns). I would expect the size to be 533328 (16 bytes * 33333).
> Fixing this estimate may become important if we need to estimate the cost of generating
the min/max/bloomfilter.



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