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From Alexander Shorin <kxe...@gmail.com>
Subject Re: Candidates for built-in filter functions?
Date Sun, 20 Mar 2016 16:34:08 GMT
On Sun, Mar 20, 2016 at 7:30 PM, Constantin Teodorescu
<brailateo@gmail.com> wrote:
> On Sun, Mar 20, 2016 at 6:19 PM, Robert Newson <rnewson@apache.org> wrote:
>
>> As part of a new effort to improve replicator performance I'm planning to
>> add new built-in filter functions. These run in the Erlang vm; saving the
>> couchjs round trip.
>> The first candidate is one that skips deleted documents as it's quite
>> common to replicate with such a filter to remove deleted tombstones.
>> This thread is for gathering more suggestions, so please help me out here.
>> I'd like to reach the level we have for reduce functions which cover a good
>> deal of the useful / functional cases.
>> One filter I'm considering would allow filtering by the value of a named
>> attribute. Something like "include this doc if doc.type equals 'purchase
>> order'". Both the name and required value would be query parameters.
>>
>
> It would be nice also:  _design/* or even something like  _id match regexp
> ...
> And the same for doc.type match regexp

That's the way to have a security issue by giving arbitrary user to
run any regexp on server side. For instance:
http://www.regular-expressions.info/catastrophic.html

--
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