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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-15023) SimpleFetchOptimizer needs to optimize limit=0
Date Sun, 23 Oct 2016 02:28:59 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15023?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pengcheng Xiong updated HIVE-15023:
-----------------------------------
    Status: Patch Available  (was: Open)

> SimpleFetchOptimizer needs to optimize limit=0
> ----------------------------------------------
>
>                 Key: HIVE-15023
>                 URL: https://issues.apache.org/jira/browse/HIVE-15023
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-15023.01.patch, HIVE-15023.02.patch
>
>
> on current master
> {code}
> hive> explain select key from src limit 0;
> OK
> STAGE DEPENDENCIES:
>   Stage-0 is a root stage
> STAGE PLANS:
>   Stage: Stage-0
>     Fetch Operator
>       limit: 0
>       Processor Tree:
>         TableScan
>           alias: src
>           Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats:
NONE
>           Select Operator
>             expressions: key (type: string)
>             outputColumnNames: _col0
>             Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats:
NONE
>             Limit
>               Number of rows: 0
>               Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
>               ListSink
> Time taken: 7.534 seconds, Fetched: 20 row(s)
> {code}



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