Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/7594#issuecomment-123914011
@zhangjiajin I'm a little worried about the performance/scalability if we
use `Array[Array[Int]]` to represent a sequence. It might create too many
objects when the dataset is large. An alternative is keeping `Array[Int]` and
use `-1` to separate itemsets, which is used by SPMF. If we support generic
item type, we can use `null` to separate itemsets. Could you test this approach?
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