DataFrame fast search
Would be really cool if would be implemented to quickly find and retrieve rows from DataFrame. Currently  I previously sort a field and the use "**searchsorted**" function in order to get the index of the selection... but this is limited to one field only and still doesn't handle multiple searches. It would be really similar to the "query" functionality but will take advantages from using some sort of "internal" precomputed index in order to reduce latency.
