wulei0302 commented on a change in pull request #13135:
URL: https://github.com/apache/flink/pull/13135#discussion_r477150966
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File path: docs/dev/stream/operators/index.md
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@@ -104,8 +104,8 @@ dataStream.filter(new FilterFunction<Integer>() {
<p>
This transformation returns a <em>KeyedStream</em>, which is,
among other things, required to use <a href="{{ site.baseurl
}}/dev/stream/state/state.html#keyed-state">keyed state</a>. </p>
{% highlight java %}
-dataStream.keyBy("someKey") // Key by field "someKey"
-dataStream.keyBy(0) // Key by the first element of a Tuple
+dataStream.keyBy(value -> value.someKey) // Key by field "someKey", or maybe
use getSomeKey
Review comment:
@dawidwys Thank you very much for your review. I am very happy for your
good suggestions. Please help me review it again. thank you.
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