Module differential_dataflow::operators::reduce

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 count differential dataflow method.
• Reduce
  Extension trait for the reduce differential dataflow method.
• ReduceCore
  Extension trait for the reduce_core differential dataflow method.
• Threshold
  Extension trait for the threshold and distinct differential dataflow methods.

Functions

• reduce_trace
  A key-wise reduction of values in an input trace.