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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5817) column name to index mapping in VectorizationContext is broken
Date Sat, 07 Dec 2013 01:21:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13841981#comment-13841981
] 

Sergey Shelukhin commented on HIVE-5817:
----------------------------------------

It seems like I cannot make a repro for select... even though there are name collisions, the
mappings are correct. Perhaps when someone finds a bug we can solve it :)

> column name to index mapping in VectorizationContext is broken
> --------------------------------------------------------------
>
>                 Key: HIVE-5817
>                 URL: https://issues.apache.org/jira/browse/HIVE-5817
>             Project: Hive
>          Issue Type: Bug
>          Components: Vectorization
>    Affects Versions: 0.13.0
>            Reporter: Sergey Shelukhin
>            Assignee: Remus Rusanu
>            Priority: Critical
>             Fix For: 0.13.0
>
>         Attachments: HIVE-5817-uniquecols.broken.patch, HIVE-5817.00-broken.patch, HIVE-5817.4.patch,
HIVE-5817.5.patch, HIVE-5817.6.patch
>
>
> Columns coming from different operators may have the same internal names ("_colNN").
There exists a query in the form {{select b.cb, a.ca from a JOIN b ON ... JOIN x ON ...;}}
 (distilled from a more complex query), which runs ok w/o vectorization. With vectorization,
it will run ok for most ca, but for some ca it will fail (or can probably return incorrect
results). That is because when building column-to-VRG-index map in VectorizationContext, internal
column name for ca that the first map join operator adds to the mapping may be the same as
internal name for cb that the 2nd one tries to add. 2nd VMJ doesn't add it (see code in ctor),
and when it's time for it to output stuff, it retrieves wrong index from the map by name,
and then wrong vector from VRG.



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