has 'type' => (is => 'ro', isa => Str, required => 1);
has 'size' => (is => 'ro', isa => Int, required => 1);
has 'is_nullable' => (is => 'ro', isa => Bool, required => 1, default => 1);
-has 'is_auto_increment' => (is => 'ro', isa => Bool, required => 0, default => 0);
+has 'is_auto_increment' => (is => 'ro', isa => Bool, required => 1, default => 0);
has 'default_value' => (is => 'ro', isa => Str, required => 0);
has 'trigger' => (is => 'ro', isa => Trigger, required => 0);