Sxnan commented on code in PR #20618:
URL: https://github.com/apache/flink/pull/20618#discussion_r949740721
##########
flink-python/pyflink/datastream/data_stream.py:
##########
@@ -895,6 +895,20 @@ def get_side_output(self, output_tag: OutputTag) ->
'DataStream':
"""
return
DataStream(self._j_data_stream.getSideOutput(output_tag.get_java_output_tag()))
+ def cache(self) -> 'DataStream':
+ """
+ Cache the intermediate result of the transformation. Only support
bounded streams and
+ currently only block mode is supported. The cache is generated lazily
at the first time the
+ intermediate result is computed. The cache will be clear when the
StreamExecutionEnvironment
+ close.
+
+ :return: The cached DataStream that can use in later job to reuse the
cached intermediate
+ result.
+
+ .. versionadded:: 1.16.0
+ """
+ return DataStream(self._j_data_stream.cache())
Review Comment:
On top of that, we also introduce `SideOutputDataStream` which supports the
cache method. I think we may need to introduce `SideOutputDataStream` in
PyFlink and let get_side_output return `SideOutputDataStream`.
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