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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/12/23 02:13:00 UTC
[jira] [Commented] (SPARK-33884) Simplify CaseWhen when one clause
is null and another is boolean
[ https://issues.apache.org/jira/browse/SPARK-33884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253839#comment-17253839 ]
Apache Spark commented on SPARK-33884:
--------------------------------------
User 'wangyum' has created a pull request for this issue:
https://github.com/apache/spark/pull/30898
> Simplify CaseWhen when one clause is null and another is boolean
> ----------------------------------------------------------------
>
> Key: SPARK-33884
> URL: https://issues.apache.org/jira/browse/SPARK-33884
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Yuming Wang
> Priority: Major
>
> This pr simplify {{CaseWhen}} when only one branch and one clause is null and another is boolean. This simplify similar to SPARK-32721.
> ||Expression||After simplify||
> |case when cond then null else false end|and(cond, null)|
> |case when cond then null else true end|or(not(cond), null)|
> |case when cond then false else null end|and(not(cond), null)|
> |case when cond then false end|and(not(cond), null)|
> |case when cond then true else null end|or(cond, null)|
> |case when cond then true end|or(cond, null)|
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