code: def test_values_distinct(self):
      rows = ((1, 2), (2, 3), (None, 3))
  
      table = Table(
          rows, ("one", "two"), [self.number_type, self.number_type]
      )
      self.assertSequenceEqual(
          table.columns["two"].values_distinct(),
          [Decimal("2"), Decimal("3")],
      )
  
imports: import pickle
  import unittest
  from decimal import Decimal
  from agate import Table
  from agate.data_types import Number, Text
label_desc: Use image node_id 9 for calling the TestColumn obj's underlying member method code with example usage: obj.test_values_distinct() without return types