Grouping
| Timestream.lookup | Return a Timestream looking up the value of self for each key. |
| Timestream.with_key | Return a Timestream with a new grouping by key. |
| Timestream.lookup | Return a Timestream looking up the value of self for each key. |
| Timestream.with_key | Return a Timestream with a new grouping by key. |