SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function if (children 1)
     ExpressionList (children 3)
      Function isFinite (children 1)
       ExpressionList (children 1)
        Function toUInt64OrZero (children 1)
         ExpressionList (children 1)
          Function toNullable (children 1)
           ExpressionList (children 1)
            Literal \'123\'
      Literal UInt64_1
      Literal UInt64_0