liukun4515 commented on PR #7247:
URL:
https://github.com/apache/arrow-datafusion/pull/7247#issuecomment-1674864494
it's reasonable for me about the changes.
```
hash join: collect left
left
repartition
right
```
The changes from remind me a issue:
When the partition of hash is `collect left`, the right side can be
repartitioned or not be repartitioned.
How to measure which method is better.
Multi partition can use multi-thread resource but has the side effect of a
new operator of `repartitionexec` after this changes
cc @mingmwang
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