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| author | Wenchen Fan <wenchen@databricks.com> | 2016-01-16 00:38:17 -0800 |
|---|---|---|
| committer | Davies Liu <davies.liu@gmail.com> | 2016-01-16 00:38:17 -0800 |
| commit | 2f7d0b68a29de9755fc9fafd9a52c048981ad880 (patch) | |
| tree | 7cda8a9bd00cf2a889d6ad5875b3f8d23e5b2275 /docs/ml-guide.md | |
| parent | 242efb7546084592a5e8122549a27117977303fb (diff) | |
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[SPARK-12856] [SQL] speed up hashCode of unsafe array
We iterate the bytes to calculate hashCode before, but now we have `Murmur3_x86_32.hashUnsafeBytes` that don't require the bytes to be word algned, we should use that instead.
A simple benchmark shows it's about 3 X faster, benchmark code: https://gist.github.com/cloud-fan/fa77713ccebf0823b2ab#file-arrayhashbenchmark-scala
Author: Wenchen Fan <wenchen@databricks.com>
Closes #10784 from cloud-fan/array-hashcode.
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