Move to nanobind#522

Merged

evertlammerts merged 50 commits into

duckdb:mainfrom

evertlammerts:prototype/nanobind-cutover

Jul 1, 2026

Commits on Jun 26, 2026

WIP: nanobind cutover — build system + umbrella + renames (not yet building)
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WIP nanobind cutover (2): object wrappers, casters, more renames
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WIP nanobind cutover (3): numpy nb::ndarray port + .cast<>() + renames
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nanobind: fix class_ holders, pybind11:: stragglers, pyconnection_default caster retirement, bulk str/int/type-of/cast conversions
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nanobind: conversions, iteration ref->value, tuple/list building, capsule, None-as-dict, exceptions
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nanobind: module-init macros, args/kwargs annotation rules, init->new_, PyTokenize/UDF tuple building
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nanobind: Value(py::str) -> cast, int_ explicit casts, .none() on connection args, remaining str/iteration fixes
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nanobind: register_exception shim, exception translator, tuple builds, type_object, capsule.data, len, more conversions
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nanobind: more str/bytes/Identifier conversions, tuple iteration, type_object
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nanobind: capsule.data, py::args binding fixes (Project/FunctionExpression), dict/list builds, bytes; numpy buffer-pointer caching (perf)
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nanobind: .none() on return_type bound-type arg
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nanobind: fix null py::str()/py::int_() default-construction in exceptions (crash on import)
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nanobind: fix accessor->wrapper reinterpret crashes (Series/Index/list type-punning) in dataframe/scan/bind/map/udf
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nanobind: fix FrameLocalsProxy (PEP 667) replacement-scan bad_cast; rebind __exit__ via lambda
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nanobind: __exit__ pointer-self + .none() args
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nanobind: enum-instance acceptance in STRING_INT caster; .none() on join other_rel
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nanobind: TransformPyConfigDict str-ify values; filesystem timestamp float cast
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nanobind: DuckDBPyType::TryConvert helper to restore implicit type conversion (shared_ptr caster strips convert)
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nanobind: UDF signature mappingproxy->dict; TryConvert for UDF parameter types
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nanobind: numpy __version__ string->tuple conversion in UDF path
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nanobind: custom shared_ptr<DuckDBPyType> caster (keep convert flag for implicit conversions); guard numpy ctypes eager-compute
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nanobind: simplify DuckDBPyType from_cpp (no type_hook)
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nanobind: UDF kind via enum .name; TryConvert clears PyErr
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nanobind: fix py::str(accessor) reinterpret bug (wrap in py::object so PyObject_Str runs) across numpy/pandas/udf/replacement paths
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nanobind: .none() on ConstantExpression value (no-default py::object accepting None)
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Commits on Jun 28, 2026