GitHub user zuyu opened a pull request:
https://github.com/apache/incubator-quickstep/pull/318
Optimizing Hash repartition on a raw pointer, instead of using TypedValue.
This PR optimizes hash repartition over a raw pointer, instead of
`TypedValue`.
Experimental results show that repartition a `lineorder` from `SSB-100` on
would reduce to `750 ms` from `1000 ms`.
Note that this PR allows supports the single partition attribute. For
multi-attribute repartition, there are two basic approaches.
1. like the single partition optimization, combine per-column hash, and
then set the bit vector for the result partition.
1. per-tuple evaluation, w/o any extra buffer used in the above approach.
The first approach on the single partition attribute actually takes `1200
ms`, while the latter takes `850 ms`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zuyu/incubator-quickstep hash-p-void-single
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/318.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #318
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