Query MongoDB comparing 2 fields in the same collection without $ where


Does MongoDB supports comparing two fields in same collection by using native operators (not $where and JavaScript)? I already looked at similar questions and all answers used $where / JavaScript.

MongoDB documentation clearly states that:

JavaScript executes more slowly than the native operators listed on this page, but is very flexible.

My primary concern is speed and I would like to use indexes if possible. So is comparing two fields in MongoDB possible without using JavaScript?

This is not currently possible, but it will be possible through the new aggregation framework currently under development (2.1+). This aggregation framework is native and does not rely on relatively slow JavaScript execution paths.

For more details check http://www.mongodb.org/display/DOCS/Aggregation+Framework and the progress at https://jira.mongodb.org/browse/SERVER-447