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https://issues.apache.org/jira/browse/ARROW-8112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17058726#comment-17058726
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David Li commented on ARROW-8112:
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Yes, it's possible to pass custom headers [~apitrou]. But if we value "it looks
like plain gRPC" we should try to map to and from gRPC codes IMO.
> [FlightRPC][C++] Some status codes don't round-trip through gRPC
> ----------------------------------------------------------------
>
> Key: ARROW-8112
> URL: https://issues.apache.org/jira/browse/ARROW-8112
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, FlightRPC
> Affects Versions: 0.16.0
> Reporter: David Li
> Assignee: David Li
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> KeyError and AlreadyExists don't fully round-trip, instead becoming UNKNOWN.
> There are others, but we don't attempt to map all the Arrow status to a gRPC
> status, only the ones that closely correspond to a gRPC error.
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