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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2016/01/19 08:02:39 UTC
[jira] [Assigned] (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 reassigned SPARK-12770:
-----------------------------------
Assignee: Reynold Xin
> 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
> Assignee: Reynold Xin
>
> There are a few things we can do:
> 1. If the first branch's condition is a true literal, remove the CaseWhen and use the value from that branch.
> 2. If a branch's condition is a false or null literal, 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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