Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18652
> The order is different from the original one that is evaluated in the
join conditions.
I'm not sure what original order you meant. By pulling out to `Project`,
they are evaluated by their order in the tables.
If you meant the original order is the one after `Sort`, I don't think it
is correct. `Sort` is the implementation detail, we should stick with the order
of rows in joining tables.
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