heronshoes commented on issue #15287:
URL: https://github.com/apache/arrow/issues/15287#issuecomment-1379697006
@westonpace I think non-key common columns (`description`) will be
preserved. Arrow's Table allows duplicated column names.
```ruby
left = Arrow::Table.new(id: [1, 2, 3], region_id: [7, 8, 9], description:
%w[A B C])
right = Arrow::Table.new(id: [1, 2, 4], description:
%w[D E F])
puts left.join(right, :id, type: :full_outer) # current implementation (1)
puts left.join(right, [:id], type: :full_outer) # is same as this (2)
#=>
id region_id description id description
0 1 7 A 1 D
1 2 8 B 2 E
2 3 9 C (null) (null)
3 (null) (null) (null) 4 F
puts left.join(right, :id, type: :full_outer) # this will merge key (3)
id region_id description description
0 1 7 A D
1 2 8 B E
2 3 9 C (null)
3 4 (null) (null) F
```
@kou Is above same as your thought?
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