get mutable offsets and values for Utf8 and binary arrays

src/array/binary/mod.rs

@@ -221,6 +221,16 @@ impl<O: Offset> BinaryArray<O> {
     impl_mut_validity!();
     impl_into_array!();
 
+    /// Returns an option of a mutable reference to the values of this [`BinaryArray`].
+    pub fn get_mut_values(&mut self) -> Option<&mut [u8]> {
+        self.values.get_mut_slice()
+    }
+
+    /// Returns an option of a mutable reference to the values of this [`BinaryArray`].
+    pub fn get_mut_offsets(&mut self) -> Option<&mut [O]> {
+        self.offsets.get_mut_slice()
+    }
+
     /// Returns its internal representation
     #[must_use]
     pub fn into_inner(self) -> (DataType, OffsetsBuffer<O>, Buffer<u8>, Option<Bitmap>) {

src/array/utf8/mod.rs

@@ -240,6 +240,16 @@ impl<O: Offset> Utf8Array<O> {
     impl_mut_validity!();
     impl_into_array!();
 
+    /// Returns an option of a mutable reference to the values of this [`Utf8Array`].
+    pub fn get_mut_values(&mut self) -> Option<&mut [u8]> {
+        self.values.get_mut_slice()
+    }
+
+    /// Returns an option of a mutable reference to the values of this [`Utf8Array`].
+    pub fn get_mut_offsets(&mut self) -> Option<&mut [O]> {
+        self.offsets.get_mut_slice()
+    }
+
     /// Returns its internal representation
     #[must_use]
     pub fn into_inner(self) -> (DataType, OffsetsBuffer<O>, Buffer<u8>, Option<Bitmap>) {

src/offset.rs

@@ -371,6 +371,16 @@ impl<O: Offset> OffsetsBuffer<O> {
             .map_left(Self)
     }
 
+    /// Returns a mutable reference to its slice, if possible.
+    ///
+    /// This operation returns [`Some`] iff this [`OffsetsBuffer`]:
+    /// * has not been cloned (i.e. [`Arc`]`::get_mut` yields [`Some`])
+    /// * has not been imported from the c data interface (FFI)
+    #[inline]
+    pub fn get_mut_slice(&mut self) -> Option<&mut [O]> {
+        self.0.get_mut_slice()
+    }
+
     /// Returns a reference to its internal [`Buffer`].
     #[inline]
     pub fn buffer(&self) -> &Buffer<O> {