SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Literal \'Hello\' (alias haystack)
    Literal \'l\' (alias needle)
    Literal \'\\\\1\' (alias replacement)
    Function replaceRegexpOne (children 1)
     ExpressionList (children 3)
      Function materialize (children 1)
       ExpressionList (children 1)
        Identifier haystack
      Identifier needle
      Identifier replacement
