SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Literal Float64_42.4242 (alias x)
    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
