HuangXingBo commented on a change in pull request #14991:
URL: https://github.com/apache/flink/pull/14991#discussion_r582795267
##########
File path: flink-python/pyflink/datastream/state.py
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@@ -311,3 +328,33 @@ def __init__(self, name: str, key_type_info:
TypeInformation, value_type_info: T
:param value_type_info: the type information of the value.
"""
super(MapStateDescriptor, self).__init__(name,
Types.MAP(key_type_info, value_type_info))
+
+
+class ReducingStateDescriptor(StateDescriptor):
+ """
+ StateDescriptor for ReducingState. This can be used to create partitioned
reducing state using
+ RuntimeContext.get_reducing_state(ReducingStateDescriptor).
+ """
+
+ def __init__(self,
+ name: str,
+ reduce_function,
+ type_info: TypeInformation):
+ """
+ Constructor of the ReducingStateDescriptor.
+
+ :param name: The name of the state.
+ :param reduce_function: The ReduceFunction used to aggregate the state.
+ :param type_info:
Review comment:
```suggestion
:param type_info: The type of the values in the state.
```
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