zhengruifeng commented on pull request #31588:
URL: https://github.com/apache/spark/pull/31588#issuecomment-781877440
test:
```
test("performance") {
val rng = new Random(123)
val n = 100000
val dim = 10000
val nnz = 100
val vectors = Array.tabulate(n) { i =>
val indices = rng.shuffle(Seq.range(0, dim)).take(nnz).sorted.toArray
val values = Array.fill(nnz)(rng.nextGaussian)
new SparseVector(dim, indices, values)
}
val slicingIndices = rng.shuffle(Seq.range(0,
dim)).take(nnz).sorted.toArray
val tic0 = System.currentTimeMillis()
Seq.range(0, 100).foreach { i =>
vectors.foreach { sv => sv.slice(slicingIndices) }
}
val toc0 = System.currentTimeMillis()
println(s"slice: ${toc0 - tic0}")
val tic1 = System.currentTimeMillis()
Seq.range(0, 100).foreach { i =>
vectors.foreach { sv => sv.sliceSorted(slicingIndices) }
}
val toc1 = System.currentTimeMillis()
println(s"sliceSorted: ${toc1 - tic1}")
}
```
results:
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