alamb commented on code in PR #6025:
URL: https://github.com/apache/arrow-rs/pull/6025#discussion_r1677155251


##########
parquet/src/arrow/buffer/dictionary_buffer.rs:
##########
@@ -162,6 +162,10 @@ impl<K: ArrowNativeType + Ord, V: OffsetSizeTrait> 
DictionaryBuffer<K, V> {
 
                 let data = match cfg!(debug_assertions) {
                     true => builder.build().unwrap(),
+                    // SAFETY: FIXME: this is unsound. data_type is passed by 
the caller without

Review Comment:
   BTW this PR is still on my list to help clean, but I am struggling to find 
time.
   
   Basically i plan to do some more code investigation to improve the comments 
here. 
   
   If there are any specific API changes / proposal to improve safety I think 
we should file a separate ticket to discuss them. I will do so if I find one 
during analysis



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