class_docstr: Find the minimum value in a column.
  
  This aggregation can be applied to columns containing :class:`.Date`,
  :class:`.DateTime`, or :class:`.Number` data.
  
  :param column_name:
      The name of the column to be searched.
code: def __init__(self, column_name):
      self._column_name = column_name
  
file_path: agate/agate/aggregations/min.py
imports: from agate.aggregations.base import Aggregation
  from agate.data_types import Date, DateTime, Number, TimeDelta
  from agate.exceptions import DataTypeError
label_desc: Use image node_id 1 to create a new Min object from inherited base classes: Aggregation with example: obj = Min(column_name)