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From "Jason Altekruse (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-2060) Support constant folding in expressions in Filter
Date Fri, 06 Feb 2015 18:32:34 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309578#comment-14309578
] 

Jason Altekruse commented on DRILL-2060:
----------------------------------------

https://reviews.apache.org/r/30697/diff

> Support constant folding in expressions in Filter
> -------------------------------------------------
>
>                 Key: DRILL-2060
>                 URL: https://issues.apache.org/jira/browse/DRILL-2060
>             Project: Apache Drill
>          Issue Type: New Feature
>          Components: Execution - Flow, Query Planning & Optimization
>            Reporter: Aditya Kishore
>            Assignee: Jacques Nadeau
>             Fix For: 0.8.0
>
>         Attachments: DRILL-2060.patch
>
>
> If one side of a filter condition is a constant expression, we should be able to evaluate
the expression in the planning phase and replace the expression with the constant value.
> For example, the following filter
> {{Where shipdate < date '1997-01-01' + interval '1' year}}
> can be re-written as
> {{Where shipdate < date '1998-01-01'}}
> Or 
> {{Where age + 5 < 42}}
> can be re-written as
> {{Where age < 37}}



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