Add DecimalArray type and width conversion methods - #183
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Conversion methods on DecimalArray<T: Integer>: - to_float64_array, to_float32_array: raw / 10^scale, null mask preserved - to_int64_array, to_int32_array: truncating division, overflow error - to_uint64_array, to_uint32_array: truncating division, overflow/negative error - from_integer_array: multiply by 10^scale, overflow error - rescale: adjust scale up (multiply) or down (truncate), overflow error Width conversion methods: - DecimalArray<i32>::to_dec64, to_dec128 (widening, lossless) - DecimalArray<i64>::to_dec128 (widening), to_dec32 (narrowing, overflow error) - DecimalArray<i128>::to_dec64, to_dec32 (narrowing, overflow error) Tests cover all conversion paths, null propagation, overflow detection, truncation behaviour, roundtrips, and empty arrays.
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* Add DecimalArray foundation and i128 trait impls (#181) * Add Decimal32, Decimal64, Decimal128 variants to ArrowType (#180) * Wire DecimalArray into NumericArray, Array, Scalar with From impls (#182) * Wire DecimalArray into NumericArray, Array, and Scalar enums with From impls and tests (#182) * Implement decimal conversion arms in NumericArray try_ accessors * Add decimal FFI import/export with arrow-rs and Polars round-trips (#186) * Add decimal FFI import/export with arrow-rs and Polars round-trips * Integrate DecimalArray into Value, ArrayV, NumericArrayV, SuperArray, SuperArrayV, and Consolidate (#187) * Add decimal broadcast dispatch and scale-aware print formatting (#184) * Add decimal arithmetic kernels with checked overflow and auto-promotion + fix null mask drop on broadcasting (#185) * Add decimal arithmetic kernels with checked overflow and auto-promotion * Propagate null mask through broadcast for all array types * Add DecimalArray type conversions and width conversion methods (#183) * Add decimal support to pyo3 and minarrow-py Python bridges (#188) * Add Decimal32 and Decimal64 round-trip tests for arrow-rs * Add decimal support to pyo3 and minarrow-py Python bridges * Make precision and scale report values for all numeric types
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Summary
.to_float64_array(),.to_float32_array(),.to_int64_array(),.to_int32_array(),.to_uint64_array(),.to_uint32_array()on DecimalArray::from_integer_array()for integer-to-decimal conversion with scale multiplication.rescale()for shifting decimal scale with overflow detectionto_dec64(),to_dec128()) and narrowing methods (to_dec32(),to_dec64()) with overflow checkingTest plan
cargo test --features decimalpasses (816 tests)cargo testwithout decimal passes (no regression)