Github user zhangjiajin commented on the pull request:
https://github.com/apache/spark/pull/7594#issuecomment-124829693
@mengxr I compared two approaches (Array[Array[Int]] and Array[Int]), I
found Array[Array[Int]] performance is better than Array[Int].
The dataset I used is BMSWebView2( KDD CUP 2000). When the support is 1500,
the running time of Array[Array[Int]] is 44s, the running time of Array[Int] is
69s. These time values are the average of three measurements.
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