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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/01/21 09:55:02 UTC

[GitHub] [arrow-datafusion] jhorstmann commented on issue #1570: Memory Limited GroupBy (Externalized / Spill)

jhorstmann commented on issue #1570:
URL: https://github.com/apache/arrow-datafusion/issues/1570#issuecomment-1018351513


   For hash aggregation I quite like the implementation described in https://dl.acm.org/doi/pdf/10.1145/2588555.2610507 (4.4). The algorithm there optimizes for cache locality by pre-aggregating into fixed-size thread-local hash tables and then overflowing into main memory partitions, but I think it should be easy to extend with also flushing these partitions to disk if they get too large.
   


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