Fix

plugins/modules/mysql_query.py

@@ -22,6 +22,9 @@ options:
     description:
     - SQL query to run. Multiple queries can be passed using YAML list syntax.
     - Must be a string or YAML list containing strings.
+    - Note that if you use the C(IF EXISTS/IF NOT EXIST) clauses in your query,
+      the module will report that the state has been changed even if it has not
+      when C(mysqlclient) connector is used.
     type: raw
     required: yes
   positional_args:
@@ -211,7 +214,8 @@ def main():
                 except mysql_driver.Warning:
                     # When something is run with IF NOT EXISTS
                     # and there's "already exists" MySQL warning,
-                    # set the flag as True
+                    # set the flag as True.
+                    # PyMySQL throws the warning, mysqlclinet does NOT.
                     already_exists = True
 
         except Exception as e:

tests/integration/targets/test_mysql_query/tasks/mysql_query_initial.yml

@@ -341,7 +341,18 @@
   # Issue https://github.com/ansible-collections/community.mysql/issues/268
   - assert:
       that:
+      # PyMySQL driver throws a warning, so the following is correct
       - result is not changed
+    when: connector.name.0 is search('pymysql')
+
+  # Issue https://github.com/ansible-collections/community.mysql/issues/268
+  - assert:
+      that:
+      # mysqlclient driver throws nothing, so it's impossible to figure out
+      # if the state was changed or not.
+      # We assume that it was for DDL queryes by default in the code
+      - result is changed
+    when: connector.name.0 is search('mysqlclient')
 
   - name: Drop db {{ test_db }}
     mysql_query: