diff --git a/src/mito2/src/memtable/bulk/part.rs b/src/mito2/src/memtable/bulk/part.rs
index 68328961a2c0..89147abf1e8d 100644
--- a/src/mito2/src/memtable/bulk/part.rs
+++ b/src/mito2/src/memtable/bulk/part.rs
@@ -170,15 +170,6 @@ impl BulkPartEncoder {
     }
 }
 
-/// Loads metadata.
-fn load_metadata(buf: &Bytes) -> Result<Arc<ParquetMetaData>> {
-    let options = ArrowReaderOptions::new()
-        .with_page_index(true)
-        .with_skip_arrow_metadata(true);
-    let metadata = ArrowReaderMetadata::load(buf, options).context(error::ReadDataPartSnafu)?;
-    Ok(metadata.metadata().clone())
-}
-
 /// Converts mutations to record batches.
 fn mutations_to_record_batch(
     mutations: &[Mutation],
diff --git a/src/mito2/src/sst/parquet/row_group.rs b/src/mito2/src/sst/parquet/row_group.rs
index 8738ed79358a..045f2a501068 100644
--- a/src/mito2/src/sst/parquet/row_group.rs
+++ b/src/mito2/src/sst/parquet/row_group.rs
@@ -156,6 +156,8 @@ impl<'a> RowGroupBase<'a> {
             .collect::<Vec<_>>()
     }
 
+    /// Assigns uncompressed chunk binary data to [RowGroupBase::column_chunks]
+    /// and returns the chunk offset and binary data assigned.
     pub(crate) fn assign_dense_chunk(
         &mut self,
         projection: &ProjectionMask,
diff --git a/src/mito2/src/sst/parquet/stats.rs b/src/mito2/src/sst/parquet/stats.rs
index 2804551fce12..09b837698cf1 100644
--- a/src/mito2/src/sst/parquet/stats.rs
+++ b/src/mito2/src/sst/parquet/stats.rs
@@ -27,7 +27,7 @@ use store_api::storage::ColumnId;
 use crate::sst::parquet::format::ReadFormat;
 
 /// Statistics for pruning row groups.
-pub struct RowGroupPruningStats<'a, T> {
+pub(crate) struct RowGroupPruningStats<'a, T> {
     /// Metadata of SST row groups.
     row_groups: &'a [T],
     /// Helper to read the SST.