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https://issues.apache.org/jira/browse/ARROW-15590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17530074#comment-17530074
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Vibhatha Lakmal Abeykoon commented on ARROW-15590:
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While looking into Substrait-Join integration, I observed that, the Substrait
spec provides the following properties for a join operation.
- Left Input
- Right Input
- Join Expression
- Join Type
While in Arrow API, the HashJoinOptions are (minimum options)
- left keys
- right keys
- join type
To translate the Substrait inputs and obtain left and right keys, is there a
way to extract the `FieldPath` from an expression?
We are not supporting experssions on join-key, right? AFAIK there is only a
filter expression available. Please correct me if I am on a wrong path.
cc [~westonpace] [~lidavidm]
> [C++] Add support for joins to the Substrait consumer
> -----------------------------------------------------
>
> Key: ARROW-15590
> URL: https://issues.apache.org/jira/browse/ARROW-15590
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Assignee: Vibhatha Lakmal Abeykoon
> Priority: Major
> Labels: substrait
>
> The streaming execution engine supports joins. The Substrait consumer does
> not currently consume joins. We should add support for this. We may want to
> split this PR into subtasks as there are many different kinds of joins and we
> may not support all of them immediately.
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