Module differential_dataflow::operators::reduce [−][src]
Applies a reduction function on records grouped by key.
The reduce
operator acts on (key, val)
data.
Records with the same key are grouped together, and a user-supplied reduction function is applied
to the key and the list of values.
The function is expected to populate a list of output values.
Traits
Count | Extension trait for the |
Reduce | Extension trait for the |
ReduceCore | Extension trait for the |
Threshold | Extension trait for the |