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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/05/06 10:27:00 UTC
[jira] [Assigned] (SPARK-39106) Correct conditional expression constant folding
[ https://issues.apache.org/jira/browse/SPARK-39106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-39106:
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Assignee: (was: Apache Spark)
> Correct conditional expression constant folding
> -----------------------------------------------
>
> Key: SPARK-39106
> URL: https://issues.apache.org/jira/browse/SPARK-39106
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: XiDuo You
> Priority: Major
>
> For a conditional expression, we can not partially fold the constant inside it's children. For example if c1 or c2 is not null, the last branch should be never hit.
> {code:java}
> SELECT COALESCE(c1, c2, 1/0);
> {code}
> Besides, for CaseWhen and If, we should mark it as foldable if it's children are foldable. It is safe since the both non-codegen and codegen code path have already respected the evaluation order.
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