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 run(self, table):
      column = table.columns[self._column_name]
  
      data = column.values_without_nulls()
      if data:
          return min(data)
  
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 4 for calling the Min obj's underlying member method code with example usage: obj.run(table) and returns: min