mjsax commented on code in PR #21237:
URL: https://github.com/apache/kafka/pull/21237#discussion_r2836843468
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streams/src/main/java/org/apache/kafka/streams/kstream/KGroupedStream.java:
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@@ -383,7 +383,10 @@ KTable<K, V> reduce(final Reducer<V> reducer,
* Thus, {@code aggregate(Initializer, Aggregator)} can be used to compute
aggregate functions like
* count (cf. {@link #count()}).
* <p>
- * The default value serde from config will be used for serializing the
result.
+ * The key serde is inherited from the upstream processing chain (e.g.,
from a {@code Consumed} instance
+ * or a previous {@code groupBy} operation).
+ * The default value serde from the config will be used for serializing
the result, as the value type
+ * may have changed.
Review Comment:
```
The default value serde from the config will be used for serializing the
result, because {@code aggregate()} may change the value type.
```
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