datafusion_2/tests/private/eval_tests.patch

diff --git a/datafusion/core/tests/core_integration.rs b/datafusion/core/tests/core_integration.rs
--- a/datafusion/core/tests/core_integration.rs
+++ b/datafusion/core/tests/core_integration.rs
@@ -60,6 +60,9 @@ mod catalog_listing;
 /// Run all tests that are found in the `tracing` directory
 mod tracing;
 
+/// Run all tests that are found in the `extension_types` directory
+mod extension_types;
+
 #[cfg(test)]
 #[ctor::ctor]
 fn init() {
diff --git a/datafusion/core/tests/extension_types/mod.rs b/datafusion/core/tests/extension_types/mod.rs
new file mode 100644
--- /dev/null
+++ b/datafusion/core/tests/extension_types/mod.rs
@@ -0,0 +1,18 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+mod pretty_printing;
diff --git a/datafusion/core/tests/extension_types/pretty_printing.rs b/datafusion/core/tests/extension_types/pretty_printing.rs
new file mode 100644
--- /dev/null
+++ b/datafusion/core/tests/extension_types/pretty_printing.rs
@@ -0,0 +1,78 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+use arrow::array::{FixedSizeBinaryArray, RecordBatch};
+use arrow_schema::extension::Uuid;
+use arrow_schema::{DataType, Field, Schema, SchemaRef};
+use datafusion::dataframe::DataFrame;
+use datafusion::error::Result;
+use datafusion::execution::SessionStateBuilder;
+use datafusion::prelude::SessionContext;
+use datafusion_expr::registry::MemoryExtensionTypeRegistry;
+use insta::assert_snapshot;
+use std::sync::Arc;
+
+fn test_schema() -> SchemaRef {
+    Arc::new(Schema::new(vec![uuid_field()]))
+}
+
+fn uuid_field() -> Field {
+    Field::new("my_uuids", DataType::FixedSizeBinary(16), false).with_extension_type(Uuid)
+}
+
+async fn create_test_table() -> Result<DataFrame> {
+    let schema = test_schema();
+
+    // define data.
+    let batch = RecordBatch::try_new(
+        schema,
+        vec![Arc::new(FixedSizeBinaryArray::from(vec![
+            &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+            &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 5, 6],
+        ]))],
+    )?;
+
+    let state = SessionStateBuilder::default()
+        .with_extension_type_registry(Arc::new(
+            MemoryExtensionTypeRegistry::new_with_canonical_extension_types(),
+        ))
+        .build();
+    let ctx = SessionContext::new_with_state(state);
+
+    ctx.register_batch("test", batch)?;
+
+    ctx.table("test").await
+}
+
+#[tokio::test]
+async fn test_pretty_print_extension_type_formatter() -> Result<()> {
+    let result = create_test_table().await?.to_string().await?;
+
+    assert_snapshot!(
+        result,
+        @r"
+    +--------------------------------------+
+    | my_uuids                             |
+    +--------------------------------------+
+    | 00000000-0000-0000-0000-000000000000 |
+    | 00010203-0405-0607-0809-000102030506 |
+    +--------------------------------------+
+    "
+    );
+
+    Ok(())
+}