SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function nullIf (children 1)
     ExpressionList (children 2)
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toDecimal128 (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Literal UInt64_0
      Function toDecimal128 (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Literal UInt64_0