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Posted to github@datafusion.apache.org by "sunchao (via GitHub)" <gi...@apache.org> on 2026/08/15 17:59:34 UTC

Re: [PR] perf: Coalesce broadcast exchange batches before broadcasting [datafusion-comet]

sunchao commented on PR #3703:
URL: https://github.com/apache/datafusion-comet/pull/3703#issuecomment-5303517794

   Does this always coalesce many record batches into a single Arrow batch? Spark sometimes allows very large BHJs, with several GB of broadcast data. It might be better to use a single compressed Arrow stream containing multiple bounded-size record batches. We may also need to update DataFusion’s hash join implementation to support multiple `RecordBatch`es.


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