alamb commented on code in PR #5781:
URL: https://github.com/apache/arrow-rs/pull/5781#discussion_r1605148022
##########
parquet/src/file/footer.rs:
##########
@@ -27,14 +27,30 @@ use crate::file::{metadata::*, reader::ChunkReader,
FOOTER_SIZE, PARQUET_MAGIC};
use crate::schema::types::{self, SchemaDescriptor};
-/// Layout of Parquet file
+/// Reads the [ParquetMetaData] from the footer of the parquet file.
+///
+/// # Layout of Parquet file
+/// ```text
/// +---------------------------+-----+---+
/// | Rest of file | B | A |
/// +---------------------------+-----+---+
-/// where A: parquet footer, B: parquet metadata.
+/// ```
+/// where
+/// * `A`: parquet footer which stores the length of the metadata.
+/// * `B`: parquet metadata.
+///
+/// # I/O
+///
+/// This method first reads the last 8 bytes of the file via
Review Comment:
The IO description previously was just incorrect
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