[jira] [Resolved] (SPARK-33527) Extend the function of decode so as consistent with mainstream databases

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-33527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-33527.
---------------------------------
    Fix Version/s: 3.2.0
         Assignee: jiaan.geng
       Resolution: Fixed

> Extend the function of decode so as consistent with mainstream databases
> ------------------------------------------------------------------------
>
>                 Key: SPARK-33527
>                 URL: https://issues.apache.org/jira/browse/SPARK-33527
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: jiaan.geng
>            Assignee: jiaan.geng
>            Priority: Major
>             Fix For: 3.2.0
>
>
> In Spark, decode(bin, charset) - Decodes the first argument using the second argument character set.
> Unfortunately this is NOT what any other SQL vendor understands DECODE to do.
> DECODE generally is a short hand for a simple case expression:
> {code:java}
> SELECT DECODE(c1, 1, 'Hello', 2, 'World', '!') FROM (VALUES (1), (2), (3)) AS T(c1)
> => 
> (Hello),
> (World)
> (!)
> {code}



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