diff --git a/src/mito2/src/memtable.rs b/src/mito2/src/memtable.rs
index ea3875ac7a..e95d5e348f 100644
--- a/src/mito2/src/memtable.rs
+++ b/src/mito2/src/memtable.rs
@@ -57,6 +57,10 @@ pub(crate) mod version;
 
 #[cfg(any(test, feature = "test"))]
 pub use bulk::part::BulkPart;
+pub use bulk::part::{
+    BulkPartEncoder, BulkPartMeta, UnorderedPart, record_batch_estimated_size,
+    sort_primary_key_record_batch,
+};
 #[cfg(any(test, feature = "test"))]
 pub use time_partition::filter_record_batch;
 
diff --git a/src/mito2/src/memtable/bulk/part.rs b/src/mito2/src/memtable/bulk/part.rs
index aa2278cb78..6aedf9a5d7 100644
--- a/src/mito2/src/memtable/bulk/part.rs
+++ b/src/mito2/src/memtable/bulk/part.rs
@@ -464,7 +464,7 @@ impl UnorderedPart {
 }
 
 /// More accurate estimation of the size of a record batch.
-pub(crate) fn record_batch_estimated_size(batch: &RecordBatch) -> usize {
+pub fn record_batch_estimated_size(batch: &RecordBatch) -> usize {
     batch
         .columns()
         .iter()
@@ -715,7 +715,7 @@ fn new_primary_key_column_builders(
 }
 
 /// Sorts the record batch with primary key format.
-fn sort_primary_key_record_batch(batch: &RecordBatch) -> Result<RecordBatch> {
+pub fn sort_primary_key_record_batch(batch: &RecordBatch) -> Result<RecordBatch> {
     let total_columns = batch.num_columns();
     let sort_columns = vec![
         // Primary key column (ascending)