docs: def _do_validation_set(self, table: pd.DataFrame, columns, validation_type, failed_only=False) -> pd.DataFrame:
          """Return a dataframe of validation results for the appropriate series vs the vector of validators."""
          validations = []
  
          for column in columns:
              validation = column.validate(table=table, failed_only=failed_only)
              validation["column_name"] = column.name
              validation["validation_type"] = validation_type
              validations.append(validation)
  
          validation_table = pd.concat(validations)
          validation_table.index.name = 'row'
  
          return validation_table.reset_index().set_index(["validation_type", "column_name", "row"])