Comments are not forward engineered to columns in postgres schema

[phpguru]

• Laravel Version: 5.5.32
• PHP Version: 7.1.11
• Database Driver & Version: pdo, pdo_postgres
  PostgreSQL 10.1 on x86_64-pc-linux-gnu, compiled by gcc (Debian 6.3.0-18) 6.3.0 20170516, 64-bit

Description:

After running the following migration against Postgres database in Docker container:

public function up()
{
    Schema::create('sample', function (Blueprint $table) {
        $table->increments('id')->comment('primary key');
        $table->timestamps();
    });
}

I could be doing something wrong, but it appears the comment is not created in the schema.

The SQL that needs to happen is [1]

COMMENT ON COLUMN sample.id IS 'primary key'; 

Steps To Reproduce:

Try migrating against postgres with a column comment.

If this is indeed a bug, if you can point me to the point in the code where this ought to happen I would be happy to attempt a PR for it.

[1] https://www.postgresql.org/docs/9.1/static/sql-comment.html

[mfn]

Already fixed in 5.6 via #21855