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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/10/16 14:47:14 UTC

[GitHub] [arrow] andygrove edited a comment on pull request #8473: ARROW-10320 [Rust] [DataFusion] Migrated from batch iterators to batch streams.

andygrove edited a comment on pull request #8473:
URL: https://github.com/apache/arrow/pull/8473#issuecomment-710090984


   > A `stream` of record batches will only return the next batch _after_ the previous one was (async) computed. Therefore, we can't parallelize, as we are blocked by the execution of the previous batch.
   
   That sounds like exactly what we need. We compute partitions in parallel and each partition produces an ordered set of batches. In some cases, it is critical that the order is deterministic.
   
   The benefit of this PR is that we don't need to wait for each operator to complete before the next one starts.


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