class_docstr: Check if the column contains null values.
  
  :param column_name:
      The name of the column to check.
class_docstr_tok: ["Check","if","the","column","contains","null","values",".",":","param","column_name",":","The","name","of","the","column","to","check","."]
code: def get_aggregate_data_type(self, table):
      return Boolean()
  
imports: from agate.aggregations.base import Aggregation
  from agate.data_types import Boolean
label_desc: Use image node_id 2 for calling the HasNulls obj's underlying member method code with example usage: obj.get_aggregate_data_type(table) and returns: Boolean