diff --git a/data/tpch/customer.parquet b/data/tpch/customer.parquet
new file mode 100644
index 0000000..ce54516
Binary files /dev/null and b/data/tpch/customer.parquet differ
diff --git a/tests/hash_aggregate.rs b/tests/hash_aggregate.rs
index 19b6d2d..6a30fd9 100644
--- a/tests/hash_aggregate.rs
+++ b/tests/hash_aggregate.rs
@@ -1,5 +1,5 @@
 use ahash::{HashMap, HashMapExt};
-use datafusion::arrow::array::{Array, Int32Array, Int64Array};
+use datafusion::arrow::array::{Array, Int64Array};
 use datafusion::arrow::datatypes::{DataType, Field, Schema};
 use datafusion::common::DFSchema;
 use datafusion::execution::context::ExecutionProps;
@@ -85,7 +85,7 @@ fn hash_aggregate() {
     let result = store.borrow_mut().remove(&pipeline_number).unwrap();
     match result {
         Entry::Batch(mut batches) => {
-            let mut batch = Arc::unwrap_or_clone(batches.pop().unwrap());
+            let batch = Arc::unwrap_or_clone(batches.pop().unwrap());
             let aggregated_column = batch
                 .column(1)
                 .as_any()