HuangXingBo commented on a change in pull request #16953:
URL: https://github.com/apache/flink/pull/16953#discussion_r694528086
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File path: docs/content.zh/docs/dev/python/datastream/operators/overview.md
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@@ -163,6 +163,29 @@ ds.map(lambda i: (i[0] + 1, i[1]),
Types.TUPLE([Types.INT(), Types.STRING()])) \
Generally, the output type needs to be specified for the map operation in the
above example if the sink only accepts special kinds of data, e.g. Row, etc.
+## Operator Chaining
+
+By default, multiple non-shuffle Python functions will be chained to avoiding
the serialization and
+deserialization and improving the performance. There are also cases where you
may want to disable
Review comment:
```suggestion
By default, multiple non-shuffle Python functions will be chained together
to avoid the serialization and
deserialization to improve the performance. There are also cases where you
may want to disable
```
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