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https://issues.apache.org/jira/browse/ARROW-16496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17556151#comment-17556151
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Vibhatha Lakmal Abeykoon commented on ARROW-16496:
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This task covers adding `ToProto` function for relations in ACERO/Substrait.
> [C++] Add roundtrip support to plans + relations
> ------------------------------------------------
>
> Key: ARROW-16496
> URL: https://issues.apache.org/jira/browse/ARROW-16496
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Assignee: Vibhatha Lakmal Abeykoon
> Priority: Major
> Labels: substrait
>
> Currently we have a significant amount effort put into round tripping
> expressions and types but we don't yet have support for relations and plans.
> Doing so would make it possible to do things like save off Arrow exec plans
> created by non-substrait means (for example, to save off a plan created by
> pyarrow or R's current non-substrait dplyr implementation).
> It would also help with testing as it would enable more round-trip testing.
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