SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function readWKTPolygon (children 1)
     ExpressionList (children 1)
      Literal \'POLYGON((0 0,10 0,10 10,0 10,0 0),(4 4,5 4,5 5,4 5,4 4))\'