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Date: Tue, 13 Jan 2015 17:09:34 +0000 (UTC)
From: "Gopal V (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12764937.1420477148000.72270.1421168974976@Atlassian.JIRA>
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 <JIRA.12764937.1420477148086@arcas>
Subject: [jira] [Updated] (HIVE-9255) Fastpath for limited fetches from
 unpartitioned tables
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     [ https://issues.apache.org/jira/browse/HIVE-9255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V updated HIVE-9255:
--------------------------
    Attachment: HIVE-9255.2.patch

Regenerate q.out for the "select cast(...) ... limit 10;" case without the filter.

> Fastpath for limited fetches from unpartitioned tables
> ------------------------------------------------------
>
>                 Key: HIVE-9255
>                 URL: https://issues.apache.org/jira/browse/HIVE-9255
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>    Affects Versions: 0.14.0, 0.15.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Minor
>         Attachments: HIVE-9255.1.patch, HIVE-9255.2.patch
>
>
> Currently, for flat tables, the threshold check is applicable for a query like {{select * from lineitem limit 1;}}.
> This is not necessary as without a filter clause, this can be executed entirely via FetchTask. Running a cluster task is redundant for this case.
> This fastpath is applicable for partitioned tables already.


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