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Refactor TreeNode recursions#7942

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Commits on Dec 19, 2023

• POC

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• - refactor transform_down() and transform_up() to work on mutable TreeNodes 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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