WweiL commented on code in PR #40937:
URL: https://github.com/apache/spark/pull/40937#discussion_r1177124740


##########
connector/connect/server/src/main/scala/org/apache/spark/sql/connect/planner/SparkConnectPlanner.scala:
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@@ -2092,6 +2097,11 @@ class SparkConnectPlanner(val session: SparkSession) {
       case path => writer.start(path)
     }
 
+    // Register the new query so that the session and query references are 
cached.
+    SparkConnectService.streamingSessionManager.registerNewStreamingQuery(

Review Comment:
   If the query throws before this line (basically in query creation, which is 
common actually, for example wrong config is set, then IllegalArgumentException 
would be thrown 
[example](https://github.com/apache/spark/blob/b26844ce879ac0097d6e1a95da18a5c3ef3c9284/connector/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaSourceProvider.scala#L227-L268)).
 What would happen? 
   My guess is that the `orElse` would be triggered:
   ```
   val query = SparkConnectService.streamingSessionManager
         .findCachedQuery(id, session) // Common case: query is cached in 
connect session manager.
         .orElse { // Else try to find it in active streams. Mostly will not be 
found here.
           Option(session.streams.get(id))
   ```
   And that'd still return a query ID not found exception?



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