Andrew Lamb created ARROW-11710:
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Summary: [Rust][DataFusion] Implement ExprRewriter to avoid tree
traversal redundancy
Key: ARROW-11710
URL: https://issues.apache.org/jira/browse/ARROW-11710
Project: Apache Arrow
Issue Type: Sub-task
Reporter: Andrew Lamb
The idea is to
1. Reduce the amount repetitions in optimizer rules to make them easier to
implement
2. Reduce the amount of repetition to make it easier to see the actual logic
(rather than having it intertwined with the code needed to do recursion)
2. Set the stage for a more general `PlanRewriter` that doesn't have to clone
its input, and can modify take their input by value and consume them
Plan is to make an ExprRewriter, the mutable counterpart to `ExpressionVisitor`
and demonstrates its usefulness by rewriting several expression transformation
rewrite passes using it.
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