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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12809) Vectorization: fast-path for coalesce if input.noNulls = true
Date Tue, 19 Jan 2016 00:11:39 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15106008#comment-15106008
] 

Gopal V commented on HIVE-12809:
--------------------------------

[~mmccline]: can you take a look at this patch? This is aimed at keeping noNulls=true if at
least 1 column fed into a coalesce is a constant.

> Vectorization: fast-path for coalesce if input.noNulls = true
> -------------------------------------------------------------
>
>                 Key: HIVE-12809
>                 URL: https://issues.apache.org/jira/browse/HIVE-12809
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 2.1.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: HIVE-12809.1.patch, HIVE-12809.2.patch
>
>
> Coalesce can skip processing other columns, if all the input columns are non-null.
> Possibly retaining, isRepeating=true.



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