* Converts a mongo-like query document (query in the above grammar) into a corresponding * QL predicate. */

* Return the name of the index which, if it exists, indexes by the values of this expression */

* afterWrite()'s return future is set when the next write may be consumed from the network (and beforeWrite() * called). */

* beforeWrite's future is set when the current write may *begin* while satisfying all ordering and pipelining * constraints The return value has no i

True if the read of this projection's field can be replaced by reads of its sub-fields

Parse a Projection tree from a BSON projection specification

Overview stopAndCheckpoint, in order to return a new checkpoint which picks up where the execution of this checkpoint stops, needs to determin