Github user KevinZwx commented on the issue:
https://github.com/apache/spark/pull/16970
I'm a little confused with the behavior of dropDuplicates with watermark.
According to my understanding of the guide documentation, if I have the
following code, I expect to deduplicate still with uuid but use timestamp
column and watermark to expire state.
`.withWatermark("timestamp", "1 day")
.dropDuplicates("uuid", "timestamp")`
But in fact I found that the program probably uses uuid and timestamp as a
combined key to deduplicate elements because the result count is much larger
than using dropDuplicates("uuid") and more close to the result with no
duplication. Is it the expected behaviorï¼If so how to achieve what I want?
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