generate-sql creates a create table statement for every type when using inheritance with column_aggregation

entity:
columns:
id:
type: integer(4)
primary: true
notnull: true
name:
type: string(200)

company:
inheritance:
extends: entity
type: column_aggregation
keyField: type
keyValue: company

person:
inheritance:
extends: entity
type: column_aggregation
keyField: type
keyValue: person

generates 3 times a create table statement for entity when i call "generate-sql" via the CLI command:
CREATE TABLE entity (id INT, name VARCHAR(200), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 ENGINE = InnoDB;
CREATE TABLE entity (id INT, name VARCHAR(200), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 ENGINE = InnoDB;
CREATE TABLE entity (id INT, name VARCHAR(200), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 ENGINE = InnoDB;