SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function hasAllTokens (children 1)
     ExpressionList (children 2)
      Literal \'a\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'[[(2,1)]]\'
        Literal \'Polygon\'