GitHub user jianqiao opened a pull request:
https://github.com/apache/incubator-quickstep/pull/193
Use partitioned aggregation for single-function DISTINCT aggregation.
This PR uses the partitioned aggregation routine for parallelizing DISTINCT
aggregation. It improves the performance of TPC-H Q16 from ~10s to ~2s with
scale factor 100 on CloudLab machine.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/apache/incubator-quickstep
parallel-distinct-agg
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/193.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 #193
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