alamb commented on PR #8991:
URL:
https://github.com/apache/arrow-datafusion/pull/8991#issuecomment-1915670650
> Hmm, except for joining keys, I think you still can list other columns
(e.g., the original 4 columns) into selection list? So they are not always able
to be removed from shuffle, I think?
Sure, if the columns are used elsewhere in the plan, they can't be removed.
I was thinking of the case when they aren't used anywhere else
However, I am not sure how often that happens in the real world
Maybe a range join 🤔
```SQL
SELECT ...
FROM stocks JOIN splits ON (
stocks.symbol = splits.symbol AND
stocks.ts < splits.max_time AND stocks.ts > splits.min_time
)
```
But I suppose the expressions are't equijoin predicates anyways 🤔
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