Psuedo-randomly selects rows at a rate specified by a parameter. The sampling algorithm is not statistically rigorous but provides a way to explore and understand a dataset. For statistically rigorous analysis summarize should be used.
| sample <rate>
|A number greater than 0 and less than 1 which specifies how many rows are selected for the next operation.
| sample 0.1 // 10% of the logs go on