title: Teradata Drop Column returns with "no more room"
body: <p>I am trying to drop a varchar(100) column of a 150 GB table (4.6 billion records). All the data in this column is null. I have 30GB more space in the database.</p>
  
  <p>When I attempt to drop the column, it says "no more room in database XY". Why does such an action needs so much space?       </p>