Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12640#issuecomment-213764953
I ran the simple benchmark in JIRA:
```
sc.parallelize(0 until 1e4.toInt, 1).map { i =>
(i, Vectors.dense(Array.fill(1e6.toInt)(1.0)))
}.toDF.rdd.count()
```
The result for master is: 199306 ms
The result after tiis PR: 69342 ms
It's still much slower than the 1.4 version, but we have unsafe format
since 1.5, and for this simple benchmark that has nearly no execution but only
serialization, it's reasonable to be slower.
cc @mengxr
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