ALTER LANGUAGE — change the definition of a procedural language
ALTER [ PROCEDURAL ] LANGUAGEnameRENAME TOnew_nameALTER [ PROCEDURAL ] LANGUAGEnameOWNER TO {new_owner| CURRENT_USER | SESSION_USER }
ALTER LANGUAGE changes the definition of a procedural language. The only functionality is to rename the language or assign a new owner. You must be superuser or owner of the language to use ALTER LANGUAGE.
nameName of a language
new_nameThe new name of the language
new_ownerThe new owner of the language
There is no ALTER LANGUAGE statement in the SQL standard.