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Posted to jira@arrow.apache.org by "Andrew Lamb (Jira)" <ji...@apache.org> on 2021/02/20 10:51:00 UTC
[jira] [Updated] (ARROW-11710) [Rust][DataFusion] Implement
ExprRewriter to avoid tree traversal redundancy
[ https://issues.apache.org/jira/browse/ARROW-11710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Lamb updated ARROW-11710:
--------------------------------
Component/s: Rust - DataFusion
> [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
> 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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