reswqa commented on code in PR #24634:
URL: https://github.com/apache/flink/pull/24634#discussion_r1610929345


##########
docs/content/docs/dev/datastream/fault-tolerance/serialization/types_serialization.md:
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@@ -37,15 +37,16 @@ Flink places some restrictions on the type of elements that 
can be in a DataStre
 The reason for this is that the system analyzes the types to determine
 efficient execution strategies.
 
-There are seven different categories of data types:
+There are eight different categories of data types:
 
 1. **Java Tuples** and **Scala Case Classes**
 2. **Java POJOs**
 3. **Primitive Types**
-4. **Regular Classes**
-5. **Values**
-6. **Hadoop Writables**
-7. **Special Types**
+4. **Common Collection Types**

Review Comment:
   > I also plan to add support for Set later. Would you think it better to 
organize them under Special Types?
   
   I think `Common Collection Types` is fair enough, but we should highlight in 
the content that we are not support `Set` now.



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