[jira] [Assigned] (ARROW-11710) [Rust][DataFusion] Implement ExprRewriter to avoid tree traversal redundancy

["Andrew Lamb (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-11710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Lamb reassigned ARROW-11710:
-----------------------------------

    Assignee: Andrew Lamb

> [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
>          Components: Rust - DataFusion
>            Reporter: Andrew Lamb
>            Assignee: Andrew Lamb
>            Priority: Major
>
> 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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