Clean unable to drop function in db2

[msallstr]

I'm getting the following db2 error when trying to run clean

[ERROR] Failed to execute goal org.flywaydb:flyway-maven-plugin:3.2.1:clean (default) on project uppfoljning: org.flywaydb.core.api.FlywayException: Unable to drop "TEST_FUNC(CHARACTER,CHARACTER): DB2 SQL Error: SQLCODE=-458, SQLSTATE=42883, SQLERRMC=UPPFOLJNING.TEST_FUNC, DRIVER=4.19.26 -> [Help 1]

From the db2 documentation
For example, assuming a function exists for which a parameter was defined as CHAR(12) on the CREATE FUNCTION statement, a reference to that function by a signature could specify this parameter as either CHAR(12), or CHAR(). The CHAR() syntax provides a way to say, "do not care about length, precision and scale attributes in finding a matching function".

A simple test case

CREATE FUNCTION TEST_FUNC ( PARAM1 char(16), PARAM2 char(36) ) 
   RETURNS INTEGER 
   LANGUAGE SQL 
RETURN 1; 

drop function test_func(character, character); -- fails
drop function test_func(character(), character()); -- succeeds
drop function test_func(character(16), character(36)); -- succeeds

To never care about length may be the way to fix this.

Using flywaydb version 3.2.1 and DB2 v10.5.500.107 with fixpack 5

[pswrdf]

DB2 v9.7 Flyway doesn't drops a function on clean operation (from java):

CREATE FUNCTION db2admin.get_version()
RETURNS VARCHAR(16)
SPECIFIC "GET_VERSION"
NO EXTERNAL action F1:
BEGIN atomic
RETURN '7.0.0';
END

console show no errors:
1:44:06 PM org.flywaydb.core.internal.command.DbClean cleanSchema
INFO: Cleaned schema "DB2ADMIN" (execution time 00:00.016s).

But fails on followed by migrate operation: Found non-empty schema "DB2ADMIN" without metadata table!
And the function still exists in schema.

[axelfontaine]

Fixed thanks to #1155 by @umefjord