viirya commented on code in PR #3326:
URL: https://github.com/apache/arrow-rs/pull/3326#discussion_r1059079407


##########
arrow-array/src/builder/generic_bytes_builder.rs:
##########
@@ -118,10 +146,34 @@ impl<T: ByteArrayType> GenericByteBuilder<T> {
         self.value_builder.as_slice()
     }
 
+    /// Returns the current values buffer as a mutable slice
+    pub fn values_slice_mut(&mut self) -> &mut [u8] {

Review Comment:
   Hmm, if we don't have this, not sure how we perform mutation on the values 
of the array?



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