mysql_info: Add parameter for __collect method (#136)

* [Add] Add parameter for __collect method

Add parameter for `__collect` method

By default the class `MySQL_Info` get all MySQL instance information,
add  parameter for `__collect` to  get only what wants to know(information)

Feature Pull Request

lib/ansible/modules/database/mysql/mysql_info.py

* typo

* [add] add changelog

- bugfixes:
  - mysql_info - add parameter for __collect to get only what are wanted (#136).

changelogs/fragments/mysql_info_add_parameter.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- mysql_info - add parameter for __collect to get only what are wanted (https://github.com/ansible-collections/community.general/pull/136).

plugins/modules/database/mysql/mysql_info.py

@@ -257,7 +257,6 @@ def get_info(self, filter_, exclude_fields, return_empty_dbs):
             filter_ (list): List of collected subsets (e.g., databases, users, etc.),
                 when it is empty, return all available information.
         """
-        self.__collect(exclude_fields, return_empty_dbs)
 
         inc_list = []
         exc_list = []
@@ -277,30 +276,51 @@ def get_info(self, filter_, exclude_fields, return_empty_dbs):
                     inc_list.append(fi)
 
             if inc_list:
+                self.__collect(exclude_fields, return_empty_dbs, set(inc_list))
+
                 for i in self.info:
                     if i in inc_list:
                         partial_info[i] = self.info[i]
 
             else:
+                not_in_exc_list = list(set(self.info) - set(exc_list))
+                self.__collect(exclude_fields, return_empty_dbs, set(not_in_exc_list))
+
                 for i in self.info:
                     if i not in exc_list:
                         partial_info[i] = self.info[i]
 
             return partial_info
 
         else:
+            self.__collect(exclude_fields, return_empty_dbs, set(self.info))
             return self.info
 
-    def __collect(self, exclude_fields, return_empty_dbs):
+    def __collect(self, exclude_fields, return_empty_dbs, wanted):
         """Collect all possible subsets."""
-        self.__get_databases(exclude_fields, return_empty_dbs)
-        self.__get_global_variables()
-        self.__get_global_status()
-        self.__get_engines()
-        self.__get_users()
-        self.__get_master_status()
-        self.__get_slave_status()
-        self.__get_slaves()
+        if 'version' in wanted or 'settings' in wanted:
+            self.__get_global_variables()
+
+        if 'databases' in wanted:
+            self.__get_databases(exclude_fields, return_empty_dbs)
+
+        if 'global_status' in wanted:
+            self.__get_global_status()
+
+        if 'engines' in wanted:
+            self.__get_engines()
+
+        if 'users' in wanted:
+            self.__get_users()
+
+        if 'master_status' in wanted:
+            self.__get_master_status()
+
+        if 'slave_status' in wanted:
+            self.__get_slave_status()
+
+        if 'slave_hosts' in wanted:
+            self.__get_slaves()
 
     def __get_engines(self):
         """Get storage engines info."""