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From "Thomas D'Silva (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3866) COUNT(col) should scan along required column families only
Date Thu, 25 May 2017 19:44:04 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16025271#comment-16025271
] 

Thomas D'Silva commented on PHOENIX-3866:
-----------------------------------------

+1

> COUNT(col) should scan along required column families only
> ----------------------------------------------------------
>
>                 Key: PHOENIX-3866
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3866
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: James Taylor
>            Priority: Minor
>             Fix For: 4.11.0
>
>         Attachments: PHOENIX-3866.patch
>
>
> These two should be equivalent:
> {code}
> 0: jdbc:phoenix:localhost> select count(B.COLB) from test;
> +----------------+
> | COUNT(B.COLB)  |
> +----------------+
> | 10054          |
> +----------------+
> 1 row selected (9.446 seconds)
> 0: jdbc:phoenix:localhost> select count(B.COLB) from test where B.COLB is not null;
> +----------------+
> | COUNT(B.COLB)  |
> +----------------+
> | 10054          |
> +----------------+
> 1 row selected (0.028 seconds)
> {code}
> Clearly the plain COUNT is doing unnecessary work.



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