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refactor: wire string-with-nulls columns to marrow StringArray (remove LegacyObjectData demotion path)
refactorCode refactoring opportunitiesCode refactoring opportunitiestech-debtTechnical debt itemsTechnical debt itemsStatus: Open.#752 In JRedrupp/bison;simplification: replace indexed for-i-in-range(len(_cols)) loops with for-col-in iterators
refactorCode refactoring opportunitiesCode refactoring opportunitiesStatus: Open.#750 In JRedrupp/bison;refactor: consolidate _from_records_build_*_col into a single parametric builder
refactorCode refactoring opportunitiesCode refactoring opportunitiestech-debtTechnical debt itemsTechnical debt itemsStatus: Open.#749 In JRedrupp/bison;refactor: retire DFScalarVisitor pattern — replace visitor structs with direct isa[] chains
refactorCode refactoring opportunitiesCode refactoring opportunitiestech-debtTechnical debt itemsTechnical debt itemsStatus: Open.#747 In JRedrupp/bison;perf: pass sort-key data + permutation directly to sort kernel to avoid materialising reordered column
performancePerformance improvementPerformance improvementStatus: Open.#733 In JRedrupp/bison;refactor: extract visitor duplication in column.mojo (~1,500 lines of repeated code)
tech-debtTechnical debt itemsTechnical debt itemsStatus: Open.#680 In JRedrupp/bison;Migrate datetime64/timedelta64 columns from List[PythonObject] to marrow arrays
enhancementNew feature or requestNew feature or requestStatus: Open.#622 In JRedrupp/bison;Zero-copy pandas interop via Arrow C Data Interface
enhancementNew feature or requestNew feature or requestStatus: Open.#621 In JRedrupp/bison;bug: marrow GroupBy sum/min/max loses precision for large int64 values (> 2^53)
tech-debtTechnical debt itemsTechnical debt itemsStatus: Open.#601 In JRedrupp/bison;- Status: Open.#98 In JRedrupp/bison;