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GH-48740: [C++] Add missing CTypeTraits for decimal types #48763

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GH-48740: [C++] Add missing CTypeTraits for decimal types #48763

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d0c0b31
GH-48740: [C++] Add missing CTypeTraits for decimal types
Jan 7, 2026
33a4ff3
Fix linting whitespace
Jan 8, 2026
733d23b
Add Decimal32 and Decimal64 traits
Jan 14, 2026
147f0bf
Merge branch 'main' of https://github.com/apache/arrow into GH-48740-…
Jan 14, 2026
be168d8
Fix Doxygen syntax in README
Jan 14, 2026
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4 changes: 2 additions & 2 deletions cpp/src/arrow/flight/sql/odbc/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -26,9 +26,9 @@ After the build succeeds, the ODBC DLL will be located in

2. Register your ODBC DLL:

Need to replace `<path\to\repo>` with actual path to repository in the commands.
Need to replace `<path\\to\\repo>` with actual path to repository in the commands.

1. `cd <path\to\repo>`
1. `cd <path\\to\\repo>`
2. Run script to register your ODBC DLL as Apache Arrow Flight SQL ODBC Driver
```
.\cpp\src\arrow\flight\sql\odbc\tests\install_odbc.cmd <path\to\repo>\cpp\build\< release | debug >\< Release | Debug>\arrow_flight_sql_odbc.dll
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22 changes: 22 additions & 0 deletions cpp/src/arrow/type_traits.h
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Expand Up @@ -135,6 +135,28 @@ struct CTypeTraits<bool> : public TypeTraits<BooleanType> {
using ArrowType = BooleanType;
};

template <>
struct CTypeTraits<Decimal128Type> {
using ArrowType = Decimal128Type;
using CType = Decimal128;
};

template <>
struct CTypeTraits<Decimal256Type> {
using ArrowType = Decimal256Type;
using CType = Decimal256;
};

template <> struct CTypeTraits<Decimal32Type> {
using ArrowType = Decimal32Type;
using CType = Decimal32;
};

template <> struct CTypeTraits<Decimal64Type> {
using ArrowType = Decimal64Type;
using CType = Decimal64;
};

#define PRIMITIVE_TYPE_TRAITS_DEF_(CType_, ArrowType_, ArrowArrayType, ArrowBuilderType, \
ArrowScalarType, ArrowTensorType, SingletonFn) \
template <> \
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