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 \'42.4242\'
        Literal UInt64_4
    Function materialize (alias y) (children 1)
     ExpressionList (children 1)
      Function toDecimal32 (children 1)
       ExpressionList (children 2)
        Literal \'2.42\'
        Literal UInt64_2
    Function round (children 1)
     ExpressionList (children 2)
      Function max2 (children 1)
       ExpressionList (children 2)
        Identifier x
        Identifier y
      Literal UInt64_6
