Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/4167#issuecomment-72139922
And normally we met some customers who set the window size very large, like
several hours, or even one day, so in these situations, normally memory might
not be enough to hold all the data in the window. So how to handle this
situation, to set the storage level explicitly? But sometimes user even do not
know window operators will cache the data, so what is your suggestion?
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