Weston Pace created ARROW-15540:
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Summary: [C++] Allow the substrait consumer to accept plans with
hints and nullable literals
Key: ARROW-15540
URL: https://issues.apache.org/jira/browse/ARROW-15540
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Weston Pace
The first pass of the substrait consumer was created with the philosophy of
rejecting any plan that it could not safely round trip (e.g. Substrait -> Arrow
Exec Plan -> Substrait).
As a result it rejects plans that contain elements we cannot represent in Arrow
Exec Plans. Two prominent elements that are likely to start existing soon in
producers are nullable literals and hints.
To put it another way, a producer might insert a hint like "this column is
sorted" into a plan. Currently the Arrow exec plans can't make use of this
kind of data. So rather than just ignore the hint we reject the plan.
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