[SPARK-57512][SQL] Introduce DelegateExpression, a logical-plan wrapper stripped before planning#56575

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Commits on Jun 26, 2026

[SPARK-57512][SQL] Introduce DelegateExpression, a logical-plan wrapper stripped before planning
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Commits on Jun 29, 2026

Support DelegateExpression in the single-pass resolver; fully lower nested delegates
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[SPARK-57512][SQL][FOLLOWUP] Harden DelegateExpression: nullIntolerant delegation, arity/type-check validation, CHAR/VARCHAR result type, V2 compound rebuild, AQE logical link
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Commits on Jun 30, 2026