## Pipeline.aggregate()


Aggregate data by a given key.


Usage


``` python
Pipeline.aggregate(
    group_by,
    agg_func="sum",
)
```


## Parameters


`group_by: str`  
The field to group by.

`agg_func: str = ``"sum"`  
Aggregation function: 'sum', 'mean', 'count'.


## Returns


`dict`  
Aggregated results.