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 UInt64_1
        Literal UInt64_0
      Function divide (children 1)
       ExpressionList (children 2)
        Function pi (children 1)
         ExpressionList
        Literal UInt64_2