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https://issues.apache.org/jira/browse/SPARK-20383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16091454#comment-16091454
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Xiaochen Ouyang commented on SPARK-20383:
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[~cloud_fan] Hello, whether the type of this issue can be changed to New
feature?
> SparkSQL unsupports to create function with the keyword 'OR REPLACE' and '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
> Assignee: 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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