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Posted to github@arrow.apache.org by "sunchao (via GitHub)" <gi...@apache.org> on 2023/06/28 14:57:38 UTC

[GitHub] [arrow-datafusion] sunchao commented on issue #4973: Improve the performance of `Aggregator`, grouping, aggregation

sunchao commented on issue #4973:
URL: https://github.com/apache/arrow-datafusion/issues/4973#issuecomment-1611602305

   Another interesting aspect from DuckDB is that it uses a vectorized hash table, instead of a general one like DF. I think the former allows it to vectorize each step of the hash table operation, including hash comparison, equality check, as well as hash probing. This is the same approach that Photon has adopted, as mentioned in their [SIGMOD'22 paper](https://dl.acm.org/doi/10.1145/3514221.3526054).


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