将文本字段保留在MySql表行或单独的表中并加入是否更高效

I know that when using a text type field within a MySql table, the data is not stored inline but only a 'pointer' is stored in the row. I only want to infrequently retrieve the text field, so is it better to keep it in the same table but omit it from query results or to keep it in a separate table and join on that table when i want to read it?I know that when using a text type field within