void removeColumn(SchemaColumn column)

Removes column from this table.

Sets column's SchemaColumn.table to null.

Source 

void removeColumn(SchemaColumn column) {
  column = this[column.name];
  if (column == null) {
    throw new SchemaException("Column ${column.name} does not exist on $name.");
  }

  _columnStorage.remove(column);
  column.table = null;
}