alamb commented on code in PR #9830:
URL: https://github.com/apache/arrow-rs/pull/9830#discussion_r3149858795


##########
parquet/src/encodings/rle.rs:
##########
@@ -129,6 +129,30 @@ impl RleEncoder {
         bit_packed_max_size.max(rle_max_size)
     }
 
+    /// Returns `true` if the encoder is currently in RLE accumulation mode

Review Comment:
   I am always a bit confused about what part of the parquet module is 
(actually) part of its public API. For anyone else that is  also confused: 
   
   RleEncoder is only reachable through the encodings module, and 
parquet/src/lib.rs:144 makes that module public only when the experimental 
feature is enabled. In the default build it is private, and even when exposed 
it is explicitly marked as having “no stability guarantees.” The docs.rs crate 
page for parquet 58.0.0 also omits enc odings from the normal public API 
surface, which is consistent with that setup: 
https://docs.rs/parquet/58.0.0/parquet/ and the feature list notes experimental 
as unstable: https://docs.rs/crate/parquet/latest



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