I'd like to be able to use complex (dotted-notation) keys such as "run.date" with the group command.

Ideally I could also do something like this where a key matches wherever a condition would:

insert( {a:[

{b:1}

,

{b:2}

,

{b:3}

]}
insert( {a:[

{b:2}

,

{b:3}

,

{b:4}

]}
insert( {a:[

{b:3}

,

{b:4}

,

{b:5}

]}

group({key:

{"a.b":true}

, reduce:some_count_func})
["a.b": 1, count:1]
["a.b": 2, count:2]
["a.b": 3, count:3]
["a.b": 4, count:2]
["a.b": 5, count:1]