code: def test_merge_different_names(self):
      table_a = Table(self.rows, self.column_names, self.column_types)
  
      column_names = ["a", "b", "c"]
  
      table_b = Table(self.rows, column_names, self.column_types)
      table_c = Table.merge([table_a, table_b])
  
      self.assertIsNot(table_c, table_a)
      self.assertIsNot(table_c, table_b)
      self.assertColumnNames(table_c, self.column_names + column_names)
      self.assertColumnTypes(
          table_c, [Number, Number, Text, Number, Number, Text]
      )
      self.assertSequenceEqual(
          table_c.rows[0], [1, 4, "a", None, None, None]
      )
      self.assertSequenceEqual(
          table_c.rows[3], [None, None, None, 1, 4, "a"]
      )
  
      for row in table_c.rows:
          self.assertSequenceEqual(
              row.keys(), self.column_names + column_names
          )
  
file_path: agate/tests/test_table/test_merge.py
imports: from agate import Table
  from agate.data_types import Number, Text
  from agate.exceptions import DataTypeError
  from agate.testcase import AgateTestCase
label_desc: Use image node_id 3 for calling the TestMerge obj's underlying member method code with example usage: obj.test_merge_different_names() without return types