class_docstr: A "column".
  
  The definition of column here is overloaded: it can represent a physical column in a
  database relation (table or view); a computed/derived column on a dataset; or an
  aggregation expression representing a metric.
code: def __repr__(self) -> str:
      return f"<Column id={self.id}>"
  
file_path: superset/superset/columns/models.py
imports: import sqlalchemy
  from flask_appbuilder import Model
  from superset.models.helpers import AuditMixinNullable, ExtraJSONMixin, ImportExportMixin
label_desc: Use image node_id 1 for calling the Column obj's underlying member method code with example usage: obj.__repr__() and returns: str, self, str