AlterQuery  t_missed_subcolumns (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration t (children 2)
    DataType Tuple (children 1)
     ExpressionList (children 2)
      NameTypePair a (children 1)
       DataType String
      NameTypePair b (children 1)
       DataType String
    Literal Tuple_(\'foo\', \'bar\')
 Identifier t_missed_subcolumns
