Merge pull request #13093 from ccutrer/fix-mysql-version-check

fix mysql version check in rename_index

activerecord/CHANGELOG.md

-*   Implement rename_index natively for MySQL > 5.7.
+*   Implement rename_index natively for MySQL >= 5.7.
 
     *Cody Cutrer*
 

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -488,7 +488,7 @@ def rename_table(table_name, new_name)
       end
 
       def rename_index(table_name, old_name, new_name)
-        if version[0] >= 5 && version[1] >= 7
+        if (version[0] == 5 && version[1] >= 7) || version[0] >= 6
           execute "ALTER TABLE #{quote_table_name(table_name)} RENAME INDEX #{quote_table_name(old_name)} TO #{quote_table_name(new_name)}"
         else
           super