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adriangb

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claude

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refactor: resolve columns by index in the leaf-pushdown rules

Replace name-based column matching (replace_cols_by_name, flat_name keys) in ExtractLeafExpressions / PushDownLeafProjections with a single index resolver. A bare `c` and a qualified `t.c` that name the same field now compare equal, so the merge finds an existing extraction spelled the other way instead of adding it a second time. Part of #25448. Co-Authored-By: Claude Opus 5.5 <[email protected]>

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datafusion/optimizer/src
- extract_leaf_expressions.rs

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