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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-13981) Improve Filter generated code to defer variable evaluation within operator
Date Thu, 17 Mar 2016 20:02:33 GMT

     [ https://issues.apache.org/jira/browse/SPARK-13981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-13981:
------------------------------------

    Assignee: Apache Spark

> Improve Filter generated code to defer variable evaluation within operator
> --------------------------------------------------------------------------
>
>                 Key: SPARK-13981
>                 URL: https://issues.apache.org/jira/browse/SPARK-13981
>             Project: Spark
>          Issue Type: Improvement
>            Reporter: Nong Li
>            Assignee: Apache Spark
>            Priority: Minor
>
> We can improve the generated filter code by deferring evaluating variables until just
before they are needed.
> For example. x > 1 and y > b
> we can do
> {code}
> x = ...
> if (x <= 1) continue
> y = ...
> {code}
> instead of currently where we do
> {code}
> x = ...
> y = ...
> if (x <= 1) continue
> ...
> {code}
> This is helpful if evaluating y has any cost.



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