Jark Wu created FLINK-21579:
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Summary: Support "SHOW USER FUNCTIONS" statement
Key: FLINK-21579
URL: https://issues.apache.org/jira/browse/FLINK-21579
Project: Flink
Issue Type: Sub-task
Components: Table SQL / API, Table SQL / Client
Reporter: Jark Wu
Currently, the {{SHOW FUNCTIONS}} lists all user-defined and built-in functions
which is very verbose. We already introduced {{listUserDefinedFunctions()}}
method on {{TableEnvironment}}. I think we can introduce a dedicate syntax to
show user-defined only functions which simply calls
{{listUserDefinedFunctions()}}. That would be very useful.
I propose to use {{SHOW USER FUNCTIONS}} which is also supported by Snowflake
[1] and Spark[2].
[1]: https://docs.snowflake.com/en/sql-reference/sql/show-user-functions.html
[2]:
https://docs.databricks.com/spark/latest/spark-sql/language-manual/sql-ref-syntax-aux-show-functions.html
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