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From "chenglei (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3491) OrderBy should be compiled out when GroupBy is not orderPreserving but OrderBy is reverse
Date Thu, 17 Nov 2016 02:51:58 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15672486#comment-15672486
] 

chenglei commented on PHOENIX-3491:
-----------------------------------

Just from PHOENIX-3451,but is irrelevant to PHOENIX-3451,so open a new JIRA

> OrderBy should be compiled out when GroupBy is not orderPreserving but OrderBy is reverse
> -----------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-3491
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3491
>             Project: Phoenix
>          Issue Type: Improvement
>    Affects Versions: 4.8.0
>            Reporter: chenglei
>
> for the following table:
> {code:borderStyle=solid}
>             CREATE TABLE ORDERBY_TEST ( 
>                     ORGANIZATION_ID INTEGER NOT NULL,
>                     CONTAINER_ID INTEGER NOT NULL,
>                     SCORE INTEGER NOT NULL,
>                     ENTITY_ID INTEGER NOT NULL,     
>                    CONSTRAINT TEST_PK PRIMARY KEY ( 
>                     ORGANIZATION_ID,
>                     CONTAINER_ID,
>                     SCORE,
>                     ENTITY_ID
>                     ));
>  {code}           
>           
> If we execute explain on the following sql: 
> {code:borderStyle=solid}           
>     SELECT ORGANIZATION_ID,SCORE FROM ORDERBY_TEST  GROUP BY ORGANIZATION_ID, SCORE ORDER
BY ORGANIZATION_ID DESC, SCORE DESC         
> {code}
> the result is :
> {code:borderStyle=solid} 
>     ----------------------------------------------------------------------+
> |                                 PLAN                                 |
> +----------------------------------------------------------------------+
> | CLIENT 2-CHUNK PARALLEL 2-WAY FULL SCAN OVER ORDERBY_TEST        |
> |     SERVER FILTER BY FIRST KEY ONLY                                  |
> |     SERVER AGGREGATE INTO DISTINCT ROWS BY [ORGANIZATION_ID, SCORE]  |
> | CLIENT MERGE SORT                                                    |
> | CLIENT SORTED BY [ORGANIZATION_ID DESC, SCORE DESC]                  |
> +----------------------------------------------------------------------+
> {code} 
> from the above explain result, we can see that the ORDER BY ORGANIZATION_ID DESC, SCORE
DESC is not  compiled out,but obviously it should be compiled out  as OrderBy.REV_ROW_KEY_ORDER_BY.



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