Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/7412#issuecomment-121508184
* PR title is off; should be "before local processing" instead of "before
projection"
* Instead of terminating on `minPatternsBeforeShuffle`, should the
termination condition be some maximum size of a projected database? The current
condition doesn't handle the case when we have `minPatternsBeforeShuffle`
prefixes but some have very large projected databases (e.g. if the sequences
are very long there may be many prefixes receiving most of the dataset even if
`minPatternsBeforeShuffle` prefixes are generated)
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