You are viewing a plain text version of this content. The canonical link for it is here.

Posted to github@arrow.apache.org by "alamb (via GitHub)" <gi...@apache.org> on 2023/10/17 20:07:55 UTC

Re: [I] TPCH, Query 18 and 17 very slow [arrow-datafusion]

alamb commented on issue #5646:
URL: https://github.com/apache/arrow-datafusion/issues/5646#issuecomment-1767091467

   BTW I think the core problem here is that DataFusion's parallel hash grouping builds the entire hash table for each input partition -- thus it requires memory proportional to the number of cores. This is tracked more in https://github.com/apache/arrow-datafusion/issues/6937


-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: github-unsubscribe@arrow.apache.org

For queries about this service, please contact Infrastructure at:
users@infra.apache.org