Github user zhangjiajin commented on the pull request:
https://github.com/apache/spark/pull/7412#issuecomment-121557045
@feynmanliang If we want get the size of projected database, we must group
by the prefix and suffix pairs. When the prefix length is small, and sequences
are very long, and the size of items is small, the size of projected database
equals the size of patterns. Otherwise, the size of projected database is small
than the size of patterns.
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