lyang24 commented on code in PR #9258:
URL: https://github.com/apache/arrow-rs/pull/9258#discussion_r2749850186
##########
parquet/src/arrow/record_reader/definition_levels.rs:
##########
@@ -286,6 +305,35 @@ impl PackedDecoder {
self.data_offset = 0;
}
+ /// Try to consume `len` levels if all are valid (max definition level).
+ ///
+ /// Returns `Ok(Some(count))` if successfully consumed `count` all-valid
levels.
+ /// Returns `Ok(None)` if there are any nulls or packed data that prevents
fast path.
+ ///
+ /// On success, advances decoder state. On failure, state is unchanged.
Review Comment:
good call updated comments
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