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From Jacek Laskowski <>
Subject Does StreamingSymmetricHashJoinExec work with watermark? I don't think so
Date Mon, 11 Nov 2019 15:04:23 GMT

I think watermark does not work for StreamingSymmetricHashJoinExec because
of the following:

1. leftKeys and rightKeys have no spark.watermarkDelayMs metadata entry at
planning [1]
2. Since the left and right keys had no watermark delay at planning the
code [2] won't find it at execution

Is my understanding correct? If not, can you point me at examples with
watermark on 1) join keys and 2) values ? Merci beaucoup.



Jacek Laskowski
The Internals of Spark SQL
The Internals of Spark Structured Streaming
The Internals of Apache Kafka
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