title: how to generate schema without column info (I just want the column names) using DBIx::Class::Schema::Loader
body: <p>I want to use <code>DBIx::Class::Schema::Loader</code> to generate the schema from Oracle database.
  My code is below. My question is how to generate the schema without column info .
  I just want the column names.</p>
  
  <pre><code>#============== generate code =================
  use strict;
  use warnings;
  use utf8;
  
  use DBIx::Class::Schema::Loader qw/ make_schema_at /;
  make_schema_at(
      'My::Schema',
      { debug =&gt; 1,
          skip_relationships =&gt; 1,
          skip_load_external  =&gt; 1,
        dump_directory =&gt; './lib',
        constraint =&gt; qr/\ATF_F_.*\z/,
        generate_pod =&gt; '0',
      },
      [ 'dbi:Oracle:test', 'test', 'test',
      ],
  );
  
  
  #========= result TfFUser.pm=================
  use warnings;
  
  use base 'DBIx::Class::Core';
  __PACKAGE__-&gt;table("TF_F_USER");
  __PACKAGE__-&gt;add_columns(
    "partition_id",
    {
      data_type =&gt; "numeric",
      is_nullable =&gt; 0,
      original =&gt; { data_type =&gt; "number" },
      size =&gt; [4, 0],
    },
  </code></pre>
  
  <p>The result I want is just</p>
  
  <pre><code>use warnings;
  
  use base 'DBIx::Class::Core';
  __PACKAGE__-&gt;table("TF_F_USER");
  __PACKAGE__-&gt;add_columns( "partition_id", column1, column2, ...
  </code></pre>
  
  <p>I don't want the column info such as</p>
  
  <pre><code>  {
      data_type =&gt; "numeric",
      is_nullable =&gt; 0,
      original =&gt; { data_type =&gt; "number" },
      size =&gt; [4, 0],
    }
  </code></pre>