save-buffer commented on code in PR #13143:
URL: https://github.com/apache/arrow/pull/13143#discussion_r882912625


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cpp/src/arrow/compute/exec/hash_join.cc:
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@@ -883,6 +875,8 @@ class HashJoinBasicImpl : public HashJoinImpl {
   //
   OutputBatchCallback output_batch_callback_;
   FinishedCallback finished_callback_;
+  RegisterTaskGroupCallback register_task_group_callback_;

Review Comment:
   Yeah, I've actually decided I want to keep the task groups inside the node 
because I think it's a bit cleaner with the accumulation. This `Register` thing 
will go away with the scheduler revamp too, so it'll be enough to just say "Run 
this lambda 100 times for me". 



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