Dandandan commented on a change in pull request #1402:
URL: https://github.com/apache/arrow-datafusion/pull/1402#discussion_r763674180
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File path: datafusion/src/logical_plan/plan.rs
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@@ -38,7 +38,7 @@ pub enum JoinType {
Inner,
/// Left Join
Left,
- /// Right Join
+ /// Right Join: will be transferred to Left Join
Review comment:
Won't removing the right join effectively mean we can't reorder a left
join to a right join?
When a left join has a bigger side on the left it means we would like to
swap the sides and the join implementation.
Besides hashing there is also the producing rows that didn't match. For a
left join this is done at the end, while for the right join this can be done
for each `RecordBatch`.
It might be a bit strange to encode a different left/right enum, because for
inner, full outer, etc. that doesn't make a lot of sense?
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