Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5697#discussion_r29111497
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
---
@@ -556,6 +579,28 @@ class SparseVector(
i += 1
}
}
+
+ override def hashCode(): Int = {
--- End diff --
For dense vectors, it may contains many zeros at the beginning, and then
the cost is still high if we look for the first 16 nonzeros. The `hashCode` is
not used in any MLlib code. This is just to reduce the overhead of Pyrolite
serializer.
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