Can't access nested map fields

[shira-redlich]

I'm trying to use nested args. e.g.: "{ "EventData" : { "Count" : 2, "sum" : 3, }, } " and my expression is: ({EventData}{Count} > 3)

But I'm getting error: argument: EventData.Count not found

Seems like there is an issue in https://github.com/zhouzhuojie/conditions/blob/master/evaluator.go#L68 We try to access the argument directly instead of checking if this is a nested arg