use append_null
+// Copyright 2020-2021 The Datafuse Authors.
+//
+// SPDX-License-Identifier: Apache-2.0.
+
+use common_exception::Result;
+
+use crate::arrays::ops::agg::ArrayAgg;
+use crate::arrays::ArrayBuilder;
+use crate::prelude::*;
+use crate::DFBooleanArray;
+use crate::DFUInt16Array;
+use crate::DFUtf8Array;
+
+
+#[test]
+fn test_array_apply() -> Result<()> {
+ let array = DFUInt16Array::new_from_iter(1u16..4u16);
+ array.append_null();
+
+ OK(())
+}
\ No newline at end of file
