SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function atan2 (children 1)
       ExpressionList (children 2)
        Literal Int64_-1
        Literal Int64_-1
      Function divide (children 1)
       ExpressionList (children 2)
        Function multiply (children 1)
         ExpressionList (children 2)
          Literal Int64_-3
          Function pi (children 1)
           ExpressionList
        Literal UInt64_4