[GitHub] [spark] viirya commented on a diff in pull request #40215: [SPARK-42591][SS][DOCS] Add examples of unblocked workloads after SPARK-42376

["viirya (via GitHub)" <gi...@apache.org>]

viirya commented on code in PR #40215:
URL: https://github.com/apache/spark/pull/40215#discussion_r1127412999


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docs/structured-streaming-programming-guide.md:
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@@ -1848,12 +1848,137 @@ Additional details on supported joins:
 
 - As of Spark 2.4, you can use joins only when the query is in Append output mode. Other output modes are not yet supported.
 
-- As of Spark 2.4, you cannot use other non-map-like operations before joins. Here are a few examples of
-  what cannot be used.
+- You cannot use mapGroupsWithState and flatMapGroupsWithState before and after joins.
 
-  - Cannot use streaming aggregations before joins.
+In append output mode, you can construct a query having non-map-like operations before/after join.

Review Comment:
   `non-map-like operations` sounds not clear to me. Can you add some examples like:
   
   ```
   In append output mode, you can construct a query having non-map-like operations, e.g. ..., ..., ..., before/after join.
   ```



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