code: function (name, newName, opts) {
              opts = opts || {};
              this.operations.push(merge({op:"renameColumn", name:name, newName:newName}, opts));
          }
docs: Modify a column's name in the DDL for the table.
  
  @example
  DB.alterTable("artist", function(){
  this.renameColumn("name", "artistName");
  //=> RENAME COLUMN name TO artist_name
  });