Distinct inner join #10503
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Distinct inner join #10503
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Signed-off-by: Jason Lowe <jlowe@nvidia.com>
jlowe
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performance
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revans2
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Mar 4, 2024
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Depends on rapidsai/cudf#15019.
Updates the inner hash join code to leverage the cudf distinct join API where the join can be performed much more quickly when it is known there are no duplicated join keys in the hash table. Since we're already doing a groupby on the build-side keys to estimate the explosiveness of a join, we already know when the hash table is using unique keys.
Running this on NDS at scale factor 3k resulted in a 2% overall improvement with the following statistically-significant (p-value < 0.05) changes at the individual query level: