SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function acos (children 1)
       ExpressionList (children 1)
        Literal Int64_-1
      Function pi (children 1)
       ExpressionList