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From "Laljo John Pullokkaran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10526) CBO (Calcite Return Path): HiveCost epsilon comparison should take row count in to account
Date Wed, 29 Apr 2015 00:28:06 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518440#comment-14518440
] 

Laljo John Pullokkaran commented on HIVE-10526:
-----------------------------------------------

I am not sure about that. We are trying to say if Latency (CPU + IO) is less than epsilon
and if row count difference is less than epsilon.

By separating CPU, IO we may loose the additive effect.

> CBO (Calcite Return Path): HiveCost epsilon comparison should take row count in to account
> ------------------------------------------------------------------------------------------
>
>                 Key: HIVE-10526
>                 URL: https://issues.apache.org/jira/browse/HIVE-10526
>             Project: Hive
>          Issue Type: Sub-task
>          Components: CBO
>            Reporter: Laljo John Pullokkaran
>            Assignee: Laljo John Pullokkaran
>             Fix For: 1.2.0
>
>         Attachments: HIVE-10526.patch
>
>




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