message: Allow trailing spaces in simple filter values
diff: @@ -240,6 +240,13 @@ class DruidFuncTestCase(unittest.TestCase):
  res = DruidDatasource.get_filters([filtr], [], column_dict)
  self.assertEqual('a', res.filter['filter']['value'])
  + def test_get_filters_keeps_trailing_spaces(self):
  + filtr = {'col': 'A', 'op': 'in', 'val': ['a ']}
  + col = DruidColumn(column_name='A')
  + column_dict = {'A': col}
  + res = DruidDatasource.get_filters([filtr], [], column_dict)
  + self.assertEqual('a ', res.filter['filter']['value'])
  +
  def test_get_filters_converts_strings_to_num(self):
  filtr = {'col': 'A', 'op': 'in', 'val': ['6']}
  col = DruidColumn(column_name='A')
  