Daobab Entity can be easy extended by another data.
Any extension has no affect to SQL, until
column() method is untouched.
This is a good solution when you want attach some related data directly into entity.
Those data can be load immediatelly (EAGER) or on demand (LAZY)
Put new object directly into map
Every entity is a map, so any value can be put and get from here via unique key. In this scenario you must remember, what object type and correctly cast the object after get
Use typical field with getter and setter
Adding fields like this is pernament, at entity level.
Create a dedicaded Column interface via Daobab style
In this scenariu you need to prepare the correct, unique Daobab Column interface.