[GitHub] [arrow-rs] houqp commented on a change in pull request #579: support struct array in pretty display

[GitBox <gi...@apache.org>]

houqp commented on a change in pull request #579:
URL: https://github.com/apache/arrow-rs/pull/579#discussion_r676085185



##########
File path: arrow/src/util/pretty.rs
##########
@@ -507,4 +507,63 @@ mod tests {
 
         Ok(())
     }
+
+    #[test]
+    fn test_pretty_format_struct() -> Result<()> {
+        let schema = Schema::new(vec![
+            Field::new(
+                "c1",
+                DataType::Struct(vec![
+                    Field::new("c11", DataType::Int32, false),
+                    Field::new(
+                        "c12",
+                        DataType::Struct(vec![Field::new("c121", DataType::Utf8, false)]),
+                        false,
+                    ),
+                ]),
+                false,
+            ),
+            Field::new("c2", DataType::Utf8, false),
+        ]);
+
+        let c1 = StructArray::from(vec![
+            (
+                Field::new("c11", DataType::Int32, false),
+                Arc::new(Int32Array::from(vec![Some(1), None, Some(5)])) as ArrayRef,
+            ),
+            (
+                Field::new(
+                    "c12",
+                    DataType::Struct(vec![Field::new("c121", DataType::Utf8, false)]),
+                    false,
+                ),
+                Arc::new(StructArray::from(vec![(
+                    Field::new("c121", DataType::Utf8, false),
+                    Arc::new(StringArray::from(vec![Some("e"), Some("f"), Some("g")]))
+                        as ArrayRef,
+                )])) as ArrayRef,
+            ),
+        ]);
+        let c2 = StringArray::from(vec![Some("a"), Some("b"), Some("c")]);
+
+        let batch =
+            RecordBatch::try_new(Arc::new(schema), vec![Arc::new(c1), Arc::new(c2)])
+                .unwrap();
+
+        let table = pretty_format_batches(&[batch])?;
+        let expected = vec![
+            r#"+-------------------------------------+----+"#,
+            r#"| c1                                  | c2 |"#,
+            r#"+-------------------------------------+----+"#,
+            r#"| {"c11": 1, "c12": {"c121": "e"}}    | a  |"#,
+            r#"| {"c11": null, "c12": {"c121": "f"}} | b  |"#,

Review comment:
       will send a follow up PR




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