diff --git a/parquet_file/src/chunk.rs b/parquet_file/src/chunk.rs
index 7f2141aaba..c99bd715a3 100644
--- a/parquet_file/src/chunk.rs
+++ b/parquet_file/src/chunk.rs
@@ -1,8 +1,12 @@
-use crate::{metadata::IoxParquetMetaData, storage::Storage};
+use crate::{
+    metadata::{DecodedIoxParquetMetaData, IoxMetadata, IoxParquetMetaData},
+    storage::Storage,
+};
 use data_types::{
     partition_metadata::{Statistics, TableSummary},
     timestamp::{TimestampMinMax, TimestampRange},
 };
+use data_types2::ParquetFile;
 use datafusion::physical_plan::SendableRecordBatchStream;
 use iox_object_store::{IoxObjectStore, ParquetFilePath};
 use predicate::Predicate;
@@ -286,3 +290,62 @@ fn extract_range(table_summary: &TableSummary) -> Option<TimestampMinMax> {
         None
     })
 }
+// Parquet file with decoded metadata.
+#[derive(Debug)]
+pub struct DecodedParquetFile {
+    pub parquet_file: ParquetFile,
+    pub parquet_metadata: Arc<IoxParquetMetaData>,
+    pub decoded_metadata: DecodedIoxParquetMetaData,
+    pub iox_metadata: IoxMetadata,
+}
+
+impl DecodedParquetFile {
+    pub fn new(parquet_file: ParquetFile) -> Self {
+        let parquet_metadata = Arc::new(IoxParquetMetaData::from_thrift_bytes(
+            parquet_file.parquet_metadata.clone(),
+        ));
+        let decoded_metadata = parquet_metadata.decode().expect("parquet metadata broken");
+        let iox_metadata = decoded_metadata
+            .read_iox_metadata_new()
+            .expect("cannot read IOx metadata from parquet MD");
+
+        Self {
+            parquet_file,
+            parquet_metadata,
+            decoded_metadata,
+            iox_metadata,
+        }
+    }
+}
+
+/// Create parquet chunk.
+pub fn new_parquet_chunk(
+    decoded_parquet_file: &DecodedParquetFile,
+    table_name: Arc<str>,
+    partition_key: Arc<str>, // old partition key format
+    metrics: ChunkMetrics,
+    iox_object_store: Arc<IoxObjectStore>,
+) -> ParquetChunk {
+    let iox_metadata = &decoded_parquet_file.iox_metadata;
+    let path = ParquetFilePath::new_new_gen(
+        iox_metadata.namespace_id,
+        iox_metadata.table_id,
+        iox_metadata.sequencer_id,
+        iox_metadata.partition_id,
+        iox_metadata.object_store_id,
+    );
+
+    let parquet_file = &decoded_parquet_file.parquet_file;
+    let file_size_bytes = parquet_file.file_size_bytes as usize;
+
+    ParquetChunk::new(
+        &path,
+        iox_object_store,
+        file_size_bytes,
+        Arc::clone(&decoded_parquet_file.parquet_metadata),
+        table_name,
+        partition_key,
+        metrics,
+    )
+    .expect("cannot create chunk")
+}
diff --git a/querier/src/chunk.rs b/querier/src/chunk.rs
index cd6b056aff..4fdb2f91ce 100644
--- a/querier/src/chunk.rs
+++ b/querier/src/chunk.rs
@@ -1,43 +1,15 @@
 use crate::cache::CatalogCache;
 use data_types2::{ChunkAddr, ChunkId, ChunkOrder, ParquetFile};
 use db::catalog::chunk::{CatalogChunk, ChunkMetadata, ChunkMetrics as CatalogChunkMetrics};
-use iox_object_store::{IoxObjectStore, ParquetFilePath};
+use iox_object_store::IoxObjectStore;
 use object_store::ObjectStore;
-use parquet_file::{
-    chunk::{ChunkMetrics as ParquetChunkMetrics, ParquetChunk},
-    metadata::{DecodedIoxParquetMetaData, IoxMetadata, IoxParquetMetaData},
+use parquet_file::chunk::{
+    new_parquet_chunk, ChunkMetrics as ParquetChunkMetrics, DecodedParquetFile, ParquetChunk,
 };
 use std::sync::Arc;
 use time::TimeProvider;
 use uuid::Uuid;
 
-/// Parquet file with decoded metadata.
-struct DecodedParquetFile {
-    parquet_file: ParquetFile,
-    parquet_metadata: Arc<IoxParquetMetaData>,
-    decoded_metadata: DecodedIoxParquetMetaData,
-    iox_metadata: IoxMetadata,
-}
-
-impl DecodedParquetFile {
-    fn new(parquet_file: ParquetFile) -> Self {
-        let parquet_metadata = Arc::new(IoxParquetMetaData::from_thrift_bytes(
-            parquet_file.parquet_metadata.clone(),
-        ));
-        let decoded_metadata = parquet_metadata.decode().expect("parquet metadata broken");
-        let iox_metadata = decoded_metadata
-            .read_iox_metadata_new()
-            .expect("cannot read IOx metadata from parquet MD");
-
-        Self {
-            parquet_file,
-            parquet_metadata,
-            decoded_metadata,
-            iox_metadata,
-        }
-    }
-}
-
 /// Adapter that can create old-gen chunks for the new-gen catalog.
 #[derive(Debug)]
 pub struct ParquetChunkAdapter {
@@ -78,17 +50,7 @@ impl ParquetChunkAdapter {
 
     /// Create parquet chunk.
     async fn new_parquet_chunk(&self, decoded_parquet_file: &DecodedParquetFile) -> ParquetChunk {
-        let iox_metadata = &decoded_parquet_file.iox_metadata;
-        let path = ParquetFilePath::new_new_gen(
-            iox_metadata.namespace_id,
-            iox_metadata.table_id,
-            iox_metadata.sequencer_id,
-            iox_metadata.partition_id,
-            iox_metadata.object_store_id,
-        );
-
         let parquet_file = &decoded_parquet_file.parquet_file;
-        let file_size_bytes = parquet_file.file_size_bytes as usize;
         let table_name = self.catalog_cache.table_name(parquet_file.table_id).await;
         let partition_key = self
             .catalog_cache
@@ -96,16 +58,13 @@ impl ParquetChunkAdapter {
             .await;
         let metrics = ParquetChunkMetrics::new(self.metric_registry.as_ref());
 
-        ParquetChunk::new(
-            &path,
-            Arc::clone(&self.iox_object_store),
-            file_size_bytes,
-            Arc::clone(&decoded_parquet_file.parquet_metadata),
+        new_parquet_chunk(
+            decoded_parquet_file,
             table_name,
             partition_key,
             metrics,
+            Arc::clone(&self.iox_object_store),
         )
-        .expect("cannot create chunk")
     }
 
     /// Create all components to create a catalog chunk using