David Li created ARROW-15357:
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Summary: [C++] Directly support nested field refs in exec plan
Key: ARROW-15357
URL: https://issues.apache.org/jira/browse/ARROW-15357
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: David Li
ARROW-14658 added support for nested field refs, but aggregations, joins, etc.
cannot directly use them (you must first project, then aggregate). The node
implementations resolve a field ref into a field path, but then throw away all
but the first index, and so they end up referencing the wrong field (the
top-level field instead of the nested one). To implement this, we should take
care we don't slow down the common case of no nested field refs.
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