mysql_variables: fix boolean value handling (#653)

* mysql_variables: fix boolean value handling

* fix

* Fix tests

* Fix tests

* Fix

* Fix

* Fix

* Fix comment

tests/integration/targets/test_mysql_variables/tasks/mysql_variables.yml

@@ -287,6 +287,99 @@
         var_name: "{{set_name}}"
         var_value: '{{set_value}}'
 
+    #=========================================================================
+    # Bugfix https://github.com/ansible-collections/community.mysql/issues/652
+
+    - name: Get server version
+      register: result
+      mysql_info:
+        <<: *mysql_params
+
+    - name: Set variable name when running on MySQL
+      set_fact:
+        log_slow_statements: log_slow_replica_statements
+      when: result.server_engine == 'MySQL'
+
+    - name: Set variable name when running on MariaDB
+      set_fact:
+        log_slow_statements: log_slow_slave_statements
+      when: result.server_engine == 'MariaDB'
+
+    - name: Set a boolean value using ON
+      mysql_variables:
+        <<: *mysql_params
+        variable: "{{ log_slow_statements }}"
+        value: "ON"
+      register: result
+
+    - name: Check that it changed
+      assert:
+        that:
+        - result is changed or result.msg == "Variable is already set to requested value."
+        - result.msg == "Variable is already set to requested value." or result.queries == ["SET GLOBAL `{{ log_slow_statements }}` = ON"]
+
+    - name: Set a boolean value again using ON
+      mysql_variables:
+        <<: *mysql_params
+        variable: "{{ log_slow_statements }}"
+        value: "ON"
+      register: result
+
+    - name: Check that it didn't change
+      assert:
+        that:
+        - result is not changed
+
+    - name: Set a boolean value again using 1
+      mysql_variables:
+        <<: *mysql_params
+        variable: "{{ log_slow_statements }}"
+        value: 1
+      register: result
+
+    - name: Check that it didn't change
+      assert:
+        that:
+        - result is not changed
+
+    - name: Set a boolean value using OFF
+      mysql_variables:
+        <<: *mysql_params
+        variable: "{{ log_slow_statements }}"
+        value: "OFF"
+      register: result
+
+    - name: Check that it changed
+      assert:
+        that:
+        - result is changed
+        - result.queries == ["SET GLOBAL `{{ log_slow_statements }}` = OFF"]
+
+    - name: Set a boolean value again using 0
+      mysql_variables:
+        <<: *mysql_params
+        variable: "{{ log_slow_statements }}"
+        value: 0
+      register: result
+
+    - name: Check that it didn't change
+      assert:
+        that:
+        - result is not changed
+
+    - name: Set a boolean value using on
+      mysql_variables:
+        <<: *mysql_params
+        variable: "{{ log_slow_statements }}"
+        value: "on"
+      register: result
+
+    - name: Check that it changed
+      assert:
+        that:
+        - result is changed
+        - result.queries == ["SET GLOBAL `{{ log_slow_statements }}` = ON"]
+
     #============================================================
     # Verify mysql_variable fails with an incorrect login_password parameter
     #