Show Functions
SHOW [USER | SYSTEM |ALL ] FUNCTIONS ([LIKE] regex | [db_name.]function_name)
Show functions matching the given regex or function name. If no regex or name is provided, then all functions are shown. IF USER
or SYSTEM
is declared then these will only show user-defined Spark SQL functions and system-defined Spark SQL functions respectively.
LIKE
This qualifier is allowed only for compatibility and has no effect.