alamb commented on a change in pull request #579:
URL: https://github.com/apache/arrow-rs/pull/579#discussion_r675129203
##########
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 |"#,
Review comment:
this is cool -- it is almost like JSON
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