create table unions (
  name text not null,
  plural text not null,
  discriminator text,
  description text,
  deprecation ,
  types ,
  attributes ,
  interfaces 
);

comment on column unions.discriminator is '
  If a type discriminator is provided, serialization of these union types will always contain a field named with the value of the discriminator that will contain the name of the type. This provides a simpler (for many use cases) JSON serialization/deserialization mechanism. When specified, apibuilder itself will verify that none of the types in the union type itself contain a field with the same name as the discriminator
';
comment on column unions.types is '
  The names of the types that make up this union type
';