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GH-15292: [C++] Typeclass alias is missing in ExtensionArray #15293

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Jan 12, 2023
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1 change: 1 addition & 0 deletions cpp/src/arrow/extension_type.h
Original file line number Diff line number Diff line change
@@ -103,6 +103,7 @@ class ARROW_EXPORT ExtensionType : public DataType {
/// \brief Base array class for user-defined extension types
class ARROW_EXPORT ExtensionArray : public Array {
public:
using TypeClass = ExtensionType;
/// \brief Construct an ExtensionArray from an ArrayData.
///
/// The ArrayData must have the right ExtensionType.