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)
      Literal Float64_2.42
    Function round (children 1)
     ExpressionList (children 2)
      Function max2 (children 1)
       ExpressionList (children 2)
        Identifier x
        Identifier y
      Literal UInt64_6
