String name default ""

(Optional) The name of the map key column. The table in which it is found depends upon the context.

• If the map key is for an element collection, the map key column is in the collection table for the map value.
• If the map key is for a ManyToMany entity relationship or for a OneToMany entity relationship using a join table, the map key column is in a join table.
• If the map key is for a OneToMany entity relationship using a foreign key mapping strategy, the map key column is in the table of the entity that is the value of the map.

Defaults to the concatenation of the following: the name of the referencing relationship field or property; "_"; "KEY".