[jira] [Resolved] (SPARK-20383) SparkSQL unsupports to create function with key word 'if not exists'

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

     [ https://issues.apache.org/jira/browse/SPARK-20383?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-20383.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

Issue resolved by pull request 17681
[https://github.com/apache/spark/pull/17681]

> SparkSQL unsupports to create function with key word 'if not exists'
> --------------------------------------------------------------------
>
>                 Key: SPARK-20383
>                 URL: https://issues.apache.org/jira/browse/SPARK-20383
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.0.0, 2.0.2, 2.1.0
>         Environment: spark2.1.0
>            Reporter: Xiaochen Ouyang
>             Fix For: 2.3.0
>
>
> unsupport to create a temporary|permanent function with the key word 'IF NOT EXISTS'.
> I think it is necessary to support this key word in 'create [temporary] fucntion ...' clause,
> For example:
> I hava an application which has three steps as follow :
> 1. insert into table t1 as select id from t where ...
> 2. create function AA as ... using jar ...
> 3. insert into table t2 select AA(id) from t1 
> my application run succussfully first time and it will throw an exeception at step 2 when it run again. So, I think it is reasonable and friendly to user application.



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