Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/2115#discussion_r67940565
--- Diff:
flink-libraries/flink-python/src/main/python/org/apache/flink/python/api/flink/plan/DataSet.py
---
@@ -192,6 +193,30 @@ def reduce(self, operator):
self._env._sets.append(child)
return child_set
+ def aggregate(self, aggregation, field):
+ """
+ Applies an Aggregate transformation (using a GroupReduceFunction)
on a non-grouped Tuple DataSet.
+ :param aggregation: The built-in aggregation function to apply on
the DataSet.
+ :param field: The index of the Tuple field on which to perform the
function.
+ :return: A GroupReduceOperator that represents the aggregated
DataSet.
+ """
+ child_set = self.reduce_group(aggregation(field), combinable=True)
--- End diff --
there should also be a test case for a non-grouped aggregation.
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