nickva commented on code in PR #4828:
URL: https://github.com/apache/couchdb/pull/4828#discussion_r1380599542
##########
src/mango/src/mango_idx_view.erl:
##########
@@ -417,7 +417,7 @@ range(_, _, LCmp, Low, HCmp, High) ->
% beginsWith requires both a high and low bound
range({[{<<"$beginsWith">>, Arg}]}, LCmp, Low, HCmp, High) ->
{LCmp0, Low0, HCmp0, High0} = range({[{<<"$gte">>, Arg}]}, LCmp, Low,
HCmp, High),
- range({[{<<"$lte">>, <<Arg/binary, 16#10FFFF>>}]}, LCmp0, Low0, HCmp0,
High0);
+ range({[{<<"$lte">>, <<Arg/binary, 16#10FFFF/utf8>>}]}, LCmp0, Low0,
HCmp0, High0);
Review Comment:
I think `U+FFFF` is the canonical "highest sorting" string according to the
collator rules, `U+10FFFF` is just the highest unicode code point numerically
but not sure if is guaranteed to be the highest sorting one. Collators can be
tailed in various ways and such.
Verifying that `U+FFFF` sorts higher than `U+10FFFF`
```erlang
(node1@127.0.0.1)80> mango_json:cmp(<<16#10FFFF/utf8>>, <<16#FFFF/utf8>>).
-1
```
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