cloud-fan commented on issue #24129: [SPARK-27190][SQL] add table capability 
for streaming
URL: https://github.com/apache/spark/pull/24129#issuecomment-483934912
 
 
   Hi @rdblue , I've added an analyzer rule to make sure that at least one mode 
works for all relations in the query.
   
   However, it turns out that it's hard to add a rule to check that every 
streaming v2 relation that will be scanned supports at least one streaming 
execution mode. For both batch and streaming, we have a fallback logic: if the 
v2 table does not have the scan capability, fallback to v1 instead of failing. 
I've opened a ticket to move the fallback logic to an analyzer rule: 
https://issues.apache.org/jira/browse/SPARK-27483

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