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## What changes were proposed in this pull request? Spark currently shows all functions when issue a `SHOW FUNCTIONS` command. This PR refines the `SHOW FUNCTIONS` command by allowing users to select all functions, user defined function or system functions. The following syntax can be used: **ALL** (default) ```SHOW FUNCTIONS``` ```SHOW ALL FUNCTIONS``` **SYSTEM** ```SHOW SYSTEM FUNCTIONS``` **USER** ```SHOW USER FUNCTIONS``` ## How was this patch tested? Updated tests and added tests to the DDLSuite Author: Herman van Hovell <hvanhovell@databricks.com> Closes #13929 from hvanhovell/SPARK-16220. |
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