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GH-48740: [C++] Add missing CTypeTraits for decimal types #50153

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GH-48740: [C++] Add missing CTypeTraits for decimal types #50153

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GH-48740: [C++] Add missing CTypeTraits for decimal types
Naurder Jun 10, 2026
c1e0955
apply reviewer suggestion: inherit from TypeTraits
Naurder Jun 11, 2026
220a94b
Address review comments: move CTypeTraits, add Dec32/64 and tests
Naurder Jun 12, 2026
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10 changes: 10 additions & 0 deletions cpp/src/arrow/type_traits.h
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Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,16 @@ struct CTypeTraits {};

/// \addtogroup type-traits
/// @{
template <>
struct CTypeTraits<Decimal128> {

@HuaHuaY HuaHuaY Jun 11, 2026 •
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I think it should inherit TypeTraits<Decimal128Type> like other specialization.

@Naurder Naurder Jun 11, 2026

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Done. Thank you very much for suggestion.

using ArrowType = Decimal128Type;
};

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

template <>
struct TypeTraits<NullType> {
using ArrayType = NullArray;
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