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https://issues.apache.org/jira/browse/SPARK-41668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-41668:
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Assignee: Apache Spark
> DECODE function returns wrong results when passed NULL
> ------------------------------------------------------
>
> Key: SPARK-41668
> URL: https://issues.apache.org/jira/browse/SPARK-41668
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.1.2
> Reporter: Serge Rielau
> Assignee: Apache Spark
> Priority: Major
>
> The DECODE function was implemented for Oracle compatibility. It works
> similar to CASE expression, but it is supposed to have one major difference:
> NULL == NULL
> [https://docs.oracle.com/database/121/SQLRF/functions057.htm#SQLRF00631]
> The Spark implementation does not observe this however:
> select decode(null, 6, 'Spark', NULL, 'SQL', 4, 'rocks');
> NULL
> The result is supposed to be 'SQL'
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