Eliminate redundant `ProjectionExec`s#21333

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Dandandan merged 7 commits intoapache:mainfrom

Dandandan:fix-projection-embedding-order

Apr 4, 2026

Commits on Apr 3, 2026

Preserve column order in projection embedding to eliminate redundant ProjectionExec nodes

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Add insta tests
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Use expression tree traversal order instead of sorting for complex expression column collection

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Revert testing submodule to master

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Revert "Use expression tree traversal order instead of sorting for complex expression column collection"
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Reapply "Use expression tree traversal order instead of sorting for complex expression column collection"
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Fix clippy collapsible_if warning

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claude
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