GH-41112: [C++] Clean up unused parameter warnings

cpp/src/arrow/array/builder_base.h

@@ -175,8 +175,9 @@ class ARROW_EXPORT ArrayBuilder {
   /// \brief Append a range of values from an array.
   ///
   /// The given array must be the same type as the builder.
-  virtual Status AppendArraySlice(const ArraySpan& array, int64_t offset,
-                                  int64_t length) {
+  virtual Status AppendArraySlice([[maybe_unused]] const ArraySpan& array,
+                                  [[maybe_unused]] int64_t offset,
+                                  [[maybe_unused]] int64_t length) {
     return Status::NotImplemented("AppendArraySlice for builder for ", *type());
   }
 

cpp/src/arrow/array/builder_nested.h

@@ -250,7 +250,7 @@ class ARROW_EXPORT VarLengthListLikeBuilder : public ArrayBuilder {
   /// \brief Append dimensions for a single list slot.
   ///
   /// ListViewBuilder overrides this to also append the size.
-  virtual void UnsafeAppendDimensions(int64_t offset, int64_t size) {
+  virtual void UnsafeAppendDimensions(int64_t offset, [[maybe_unused]] int64_t size) {
     offsets_builder_.UnsafeAppend(static_cast<offset_type>(offset));
   }
 

cpp/src/arrow/array/builder_primitive.h

@@ -32,9 +32,10 @@ namespace arrow {
 class ARROW_EXPORT NullBuilder : public ArrayBuilder {
  public:
   explicit NullBuilder(MemoryPool* pool = default_memory_pool(),
-                       int64_t alignment = kDefaultBufferAlignment)
+                       [[maybe_unused]] int64_t alignment = kDefaultBufferAlignment)
       : ArrayBuilder(pool) {}
-  explicit NullBuilder(const std::shared_ptr<DataType>& type,
+
+  explicit NullBuilder([[maybe_unused]] const std::shared_ptr<DataType>& type,
                        MemoryPool* pool = default_memory_pool(),
                        int64_t alignment = kDefaultBufferAlignment)
       : NullBuilder(pool, alignment) {}

cpp/src/arrow/device.h

@@ -139,7 +139,8 @@ class ARROW_EXPORT Device : public std::enable_shared_from_this<Device>,
   /// This should create the appropriate stream type for the device,
   /// derived from Device::Stream to allow for stream ordered events
   /// and memory allocations.
-  virtual Result<std::shared_ptr<Stream>> MakeStream(unsigned int flags) {
+  virtual Result<std::shared_ptr<Stream>> MakeStream(
+      [[maybe_unused]] unsigned int flags) {
     return NULLPTR;
   }
 
@@ -149,8 +150,9 @@ class ARROW_EXPORT Device : public std::enable_shared_from_this<Device>,
   /// @param release_fn a function to call during destruction, `nullptr` or
   ///        a no-op function can be passed to indicate ownership is maintained
   ///        externally
-  virtual Result<std::shared_ptr<Stream>> WrapStream(void* device_stream,
-                                                     Stream::release_fn_t release_fn) {
+  virtual Result<std::shared_ptr<Stream>> WrapStream(
+      [[maybe_unused]] void* device_stream,
+      [[maybe_unused]] Stream::release_fn_t release_fn) {
     return NULLPTR;
   }
 

cpp/src/arrow/type.h

@@ -1723,7 +1723,9 @@ class ARROW_EXPORT MonthIntervalType : public IntervalType {
 
   MonthIntervalType() : IntervalType(type_id) {}
 
-  std::string ToString(bool show_metadata = false) const override { return name(); }
+  std::string ToString([[maybe_unused]] bool show_metadata = false) const override {
+    return name();
+  }
   std::string name() const override { return "month_interval"; }
 };
 
@@ -1759,7 +1761,9 @@ class ARROW_EXPORT DayTimeIntervalType : public IntervalType {
 
   int bit_width() const override { return static_cast<int>(sizeof(c_type) * CHAR_BIT); }
 
-  std::string ToString(bool show_metadata = false) const override { return name(); }
+  std::string ToString([[maybe_unused]] bool show_metadata = false) const override {
+    return name();
+  }
   std::string name() const override { return "day_time_interval"; }
 };
 
@@ -1799,7 +1803,9 @@ class ARROW_EXPORT MonthDayNanoIntervalType : public IntervalType {
 
   int bit_width() const override { return static_cast<int>(sizeof(c_type) * CHAR_BIT); }
 
-  std::string ToString(bool show_metadata = false) const override { return name(); }
+  std::string ToString([[maybe_unused]] bool show_metadata = false) const override {
+    return name();
+  }
   std::string name() const override { return "month_day_nano_interval"; }
 };