Refactor TreeNode recursions#7942

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peter-toth wants to merge 11 commits intoapache:mainfrom

peter-toth:refactor-treenode-apply

Commits on Dec 19, 2023

POC
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- refactor `transform_down()` and `transform_up()` to work on mutable `TreeNode`s and use them in a few examples
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- refactor `EnforceDistribution` using `transform_down_with_payload()`
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Commits on Dec 20, 2023

make `TreeNode` methods naming consitent, after this change we have `visit()`, `visit_down()`, `transform()`, `transform_down()`, `transform_up()`, `transform_with_payload()`, `transform_down_with_…
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fix `transform_with_payload()` to behave like `transform_down_with_payload()` in its pre-order transform (`f_down`) function
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add docs
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Merge remote-tracking branch 'origin/main' into refactor-treenode-apply
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remove `Expr::Nop`, define `Expr::Literal(ScalarValue::Null)` as default for `Expr`
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fix docs
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Commits on Jan 2, 2024

revert `transform_with_payload`, `transform_down_with_payload` and `transform_up_with_payload` related changes
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Commits on Jan 3, 2024

Merge remote-tracking branch 'origin/main' into refactor-treenode-apply
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committed