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https://issues.apache.org/jira/browse/ARROW-16860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17559202#comment-17559202
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Weston Pace commented on ARROW-16860:
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I think I answered this offline but, for clarity (and I think this is what you
are arguing for):
* Start with an empty ExtensionSet
* Convert the relations to protobuf
* During the various ToProto calls there will be calls made to
extension_set->EncodeFunction which will populate the extension set.
* Once all top-level relations are converted to protobuf the extension set
should be populated. So now it is just a matter of converting the populated
extension set to protobuf and adding it to the plan
> [C++] Add Roundtrip Support to Plans
> ------------------------------------
>
> Key: ARROW-16860
> URL: https://issues.apache.org/jira/browse/ARROW-16860
> Project: Apache Arrow
> Issue Type: Improvement
> Reporter: Vibhatha Lakmal Abeykoon
> Assignee: Vibhatha Lakmal Abeykoon
> Priority: Major
>
> Convert an ACERO plan to a Substrait plan. The missing component is to add
> `ToProto` function to convert an ACERO `ExecPlan` to a Substrait-Plan.
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