Jefffrey commented on code in PR #7013:
URL: https://github.com/apache/arrow-rs/pull/7013#discussion_r1929882884


##########
arrow-buffer/src/builder/null.rs:
##########
@@ -134,6 +133,42 @@ impl NullBufferBuilder {
         }
     }
 
+    /// Returns the capacity of the buffer
+    #[inline]
+    pub fn capacity(&self) -> usize {
+        if let Some(buf) = self.bitmap_builder.as_ref() {
+            buf.capacity()
+        } else {
+            0

Review Comment:
   I think we don't need to add a `capacity()` method given `allocated_size()` 
seems to already do what is required



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