Andy Grove created ARROW-6892:
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Summary: [Rust] [DataFusion] Implement optimizer rule to remove
redundant projections
Key: ARROW-6892
URL: https://issues.apache.org/jira/browse/ARROW-6892
Project: Apache Arrow
Issue Type: New Feature
Components: Rust, Rust - DataFusion
Reporter: Andy Grove
Fix For: 1.0.0
Currently we have code in the SQL query planner that wraps aggregate queries in
a projection (if needed) to preserve the order of the final results. This is
needed because the aggregate query execution always returns a result with
grouping expressions first and then aggregate expressions.
It would be better (simpler, more readable code) to always wrap aggregates in
projections and have an optimizer rule to remove redundant projections. There
are likely other use cases where redundant projections might exist too.
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