diff --git a/cpp/src/arrow/flight/sql/odbc/README.md b/cpp/src/arrow/flight/sql/odbc/README.md
index 8c2d9705a1d..27621d256d6 100644
--- a/cpp/src/arrow/flight/sql/odbc/README.md
+++ b/cpp/src/arrow/flight/sql/odbc/README.md
@@ -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
diff --git a/cpp/src/arrow/type_traits.h b/cpp/src/arrow/type_traits.h
index 1b7a02e1085..1992dd15096 100644
--- a/cpp/src/arrow/type_traits.h
+++ b/cpp/src/arrow/type_traits.h
@@ -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 <>                                                                            \