alamb commented on code in PR #7089:
URL: https://github.com/apache/arrow-rs/pull/7089#discussion_r1945293119


##########
arrow-buffer/src/builder/null.rs:
##########
@@ -217,7 +217,7 @@ impl NullBufferBuilder {
         self.bitmap_builder.as_mut().map(|b| b.as_slice_mut())
     }
 
-    /// Return the allocated size of this builder, in bytes, useful for memory 
accounting.
+    /// Return the allocated size of this builder, in bits, useful for memory 
accounting.

Review Comment:
   This documentation is wrong -- as it uses `capacity()` directly which 
returns a size in bits
   
   I actually think it would be better if we had a function that returned 
allocated size in bytes (maybe we can deprecate this one and make a new one 
like `allocated_bytes()` or something for clarity.



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