Couchbase 2.0: setting group_level in view queries with the Java API

I was surprised to see that it makes a difference in which order arguments are passed to the Couchbase http api via port 8092 (the same seems to be true for CouchDB on port 5984). This is important if you are using "group_level" and "group" in one call (I know this doesn't make sense, but please continue reading). The second argument in the http request seems to override the first.

Say you have an array as an index and want to set the group_level to 1 to group by the first entry of the array.

Setting "group" to true or false before setting the group_level to 1 doesn't matter as it gets overwritten. So
reduce=true&group=false&group_level=1
and
reduce=true&group=true&group_level=1
both work to set the group_level to 1.

However if you set the group_level to 1 first and then set group in the query things are going wrong:
reduce=true&group_level=1&group=false
effectively deactivates grouping and
reduce=true&group_level=1&group=true
groups by the whole array.

So far so good, but here is the problem:

The only way to set the group_level in a Query with the Java API is this:
Query net.spy.memcached.protocol.couch.Query.setGroup(boolean group, int grouplevel)
It sets both "group" and "group_level" for a query.

The function adds both parameters as key->value mapping to a Hash with all parameters of the query, and when building the uri for the http query it loops over the entrySet of the Hash and adds all entries as parameters to the query. So effectivly both the "group" and "group_level" parameters are added in random order. This makes it impossible to query your views reliably with a desired group_level.

Do I miss someting or is this really a problem?

Stefan

PS: This is not a theoretical problem. For us (and I assume for others using group_level) this is a showstopper. We had to add

public Query setGroupLevel(int grouplevel) {
args.put(GROUPLEVEL, Integer.valueOf((grouplevel)));
return this;
}

to net.spy.memcached.protocol.couch.Query to make things work.