Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5697#discussion_r29111498
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala
---
@@ -63,20 +63,27 @@ sealed trait Vector extends Serializable {
Vectors.equals(0 until d1.size, d1.values, s1.indices,
s1.values)
case (_, _) => util.Arrays.equals(this.toArray, v2.toArray)
}
- }
case _ => false
}
}
+ /**
+ * Returns a hash code value for the vector. The hash code is based on
its size and its nonzeros
+ * in the first 16 entries, using a hash algorithm similar to
[[java.util.Arrays.hashCode]].
+ */
override def hashCode(): Int = {
--- End diff --
This is just a reference implementation for subclasses to optimize.
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