SYNOPSIS
my $add_field = Monorail::Change::AddField->new(
table => $fld->table->name,
name => $fld->name,
type => $fld->data_type,
is_nullable => $fld->is_nullable,
is_primary_key => $fld->is_primary_key,
is_unique => $fld->is_uniq,
default_value => $fld->default_value,
);
print $add_field->as_perl;
$add_field->as_sql;
$add_field->transform_dbix($dbix)