Field("field").Field("field")  nil

**Describe the bug**
I have a row in my db like this `rep:[
 {id:1,commentaryt:"com"}
]`

Query:
` r.Table("table").Filter(func(row r.Term) r.Term {
		return row.Field("rep").Field("id").Eq(userid)
	})`
return nil

**System info**
 - OS: [debian 10]
 - RethinkDB Version: [2.4.0]
