SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function materialize (alias x) (children 1)
     ExpressionList (children 1)
      Function toDecimal32 (children 1)
       ExpressionList (children 2)
        Literal \'0.4242\'
        Literal UInt64_4
    Literal Float64_0.24 (alias y)
    Function round (children 1)
     ExpressionList (children 2)
      Function atan2 (children 1)
       ExpressionList (children 2)
        Identifier y
        Identifier x
      Literal UInt64_6
