Neal Richardson created ARROW-16631:
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Summary: [C++] Support order by derived column
Key: ARROW-16631
URL: https://issues.apache.org/jira/browse/ARROW-16631
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Neal Richardson
You can't do the equivalent of
{code}
SELECT x, y FROM table ORDER BY x * y ASC;
{code}
because sorting requires a named column AND because sorting is only done in a
SinkNode. You can project to {x, y, x*y} then sort on x*y, but you can't then
project back to {x, y} on the sorted data because that's a new ExecPlan and
order is not preserved. In R we have to handle this outside of an ExecPlan.
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