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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2016/01/12 09:02:39 UTC

[jira] [Updated] (SPARK-12770) Implement rules for branch elimination for CaseWhen in SimplifyConditionals

     [ https://issues.apache.org/jira/browse/SPARK-12770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin updated SPARK-12770:
--------------------------------
    Summary: Implement rules for branch elimination for CaseWhen in SimplifyConditionals  (was: Implement rules for removing unnecessary branches for CaseWhen in SimplifyConditionals)

> Implement rules for branch elimination for CaseWhen in SimplifyConditionals
> ---------------------------------------------------------------------------
>
>                 Key: SPARK-12770
>                 URL: https://issues.apache.org/jira/browse/SPARK-12770
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Optimizer, SQL
>            Reporter: Reynold Xin
>
> There are a few things we can do:
> 1. If a branch is a true literal, remove the CaseWhen and use the value from that branch.
> 2. If a branch is a literal that is false or null, remove that branch.
> 3. If only the else branch is left, remove the CaseWhen and use the value from the else branch.



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