Dandandan commented on pull request #9042: URL: https://github.com/apache/arrow/pull/9042#issuecomment-752418069
@jorgecarleitao Yes, small things can have a big effect... The difference is a bit "magnified" though because of the `n*n` behavior in the join. If you have ideas of how to solve this issue, please share. What looks like is the problem here: * for the left side of the join we `.iter()` on the left side batches iteration (a couple of times, in the join implementation itself and in `MutableDataArray`) when we process a probe-side batch. * if we halve the batch size, the number of items in the build-side array grows by two, but also the number of probe-side batches we process in the join, thus the `n*n` slowdown. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected]
