last
last.RdAggregate function: returns the last value in a group.
Arguments
- x
- column to compute on. 
- ...
- further arguments to be passed to or from other methods. 
- na.rm
- a logical value indicating whether NA values should be stripped before the computation proceeds. 
Details
The function by default returns the last values it sees. It will return the last non-missing value it sees when na.rm is set to true. If all values are missing, then NA is returned. Note: the function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle.