[GitHub] [spark] HeartSaVioR commented on issue #26162: [SPARK-29438][SS] Use partition ID of StateStoreAwareZipPartitionsRDD for determining partition ID of state store in stream-stream join

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HeartSaVioR commented on issue #26162: [SPARK-29438][SS] Use partition ID of StateStoreAwareZipPartitionsRDD for determining partition ID of state store in stream-stream join
URL: https://github.com/apache/spark/pull/26162#issuecomment-544334257
 
 
   There's even no need to assume only right side has input rows, as Spark runs empty batch when watermark is advanced in a batch. It can also occur when there's no data in both sides.
   
   We've artificially made this fail via setting broadcast join threshold to be something we may not use for production, but it will occur in any case where left side of UNION could have less partitions.

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