Install galaxy plugin
INSTALL PLUGIN galaxy SONAME "galaxy.so";
galax plugin status
show global status like '%galaxy%';
Variable_name	Value
Galaxyx_address	#
Galaxyx_port	#
galaxy_bloomfilter_call_count	#
galaxy_hllndv_call_count	#
galaxy_hyperloglog_call_count	#
performance_schema metrics
select * from performance_schema.user_defined_functions where UDF_NAME in ('hyperloglog', 'hllndv', 'bloomfilter');
UDF_NAME	UDF_RETURN_TYPE	UDF_TYPE	UDF_LIBRARY	UDF_USAGE_COUNT
bloomfilter	integer	function		1
hllndv	integer	aggregate		1
hyperloglog	char	aggregate		1
test create/drop inner function
create function bloomfilter returns int soname "galaxy.so";
ERROR HY000: Function 'bloomfilter' already exists
create function hyperloglog returns int soname "galaxy.so";
ERROR HY000: Function 'hyperloglog' already exists
create function hllndv returns int soname "galaxy.so";
ERROR HY000: Function 'hllndv' already exists
drop function bloomfilter;
ERROR HY000: DROP FUNCTION can't drop a dynamically registered user defined function
drop function hyperloglog;
ERROR HY000: DROP FUNCTION can't drop a dynamically registered user defined function
drop function hllndv;
ERROR HY000: DROP FUNCTION can't drop a dynamically registered user defined function
UNINSTALL PLUGIN galaxy;
select * from performance_schema.user_defined_functions where UDF_NAME in ('hyperloglog', 'hllndv', 'bloomfilter');
UDF_NAME	UDF_RETURN_TYPE	UDF_TYPE	UDF_LIBRARY	UDF_USAGE_COUNT