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https://issues.apache.org/jira/browse/FLINK-14171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16953598#comment-16953598
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Timo Walther commented on FLINK-14171:
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As far as I can see FLIP-57 also discusses a rough design. So we will not
support the syntax `SHOW USER FUNCTIONS` but slightly different.
> Add 'SHOW USER FUNCTIONS' support in SQL CLI
> --------------------------------------------
>
> Key: FLINK-14171
> URL: https://issues.apache.org/jira/browse/FLINK-14171
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Client
> Affects Versions: 1.9.0
> Reporter: Canbin Zheng
> Priority: Major
> Fix For: 1.10.0
>
>
> Currently *listUserDefinedFunctions* has been supported in Executor, I think
> we can add 'SHOW USER FUNCTIONS' support to make it a end-2-end functionality.
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