alamb commented on code in PR #3703:
URL: https://github.com/apache/arrow-rs/pull/3703#discussion_r1105850468
##########
arrow-json/src/raw/mod.rs:
##########
@@ -541,6 +544,41 @@ mod tests {
assert!(c.is_null(1));
}
+ #[test]
+ fn test_map() {
+ let buf = r#"
+ {"map": {"a": ["foo", null]}}
+ {"map": {"a": [null], "b": []}}
+ {"map": {"c": null, "a": ["baz"]}}
+ "#;
+ let list = DataType::List(Box::new(Field::new("element",
DataType::Utf8, true)));
+ let entries = DataType::Struct(vec![
+ Field::new("key", DataType::Utf8, false),
+ Field::new("value", list, true),
+ ]);
+
+ let map = DataType::Map(Box::new(Field::new("entries", entries,
true)), false);
+ let schema = Arc::new(Schema::new(vec![Field::new("map", map, true)]));
+
+ let batches = do_read(buf, 1024, schema);
+ assert_eq!(batches.len(), 1);
+
+ let map = as_map_array(batches[0].column(0).as_ref());
+ let map_keys = as_string_array(map.keys().as_ref());
+ let map_values = as_list_array(map.values().as_ref());
+ assert_eq!(map.value_offsets(), &[0, 1, 3, 5]);
+
+ let k: Vec<_> = map_keys.iter().map(|x| x.unwrap()).collect();
+ assert_eq!(&k, &["a", "a", "b", "c", "a"]);
Review Comment:
👍
##########
arrow-json/src/raw/mod.rs:
##########
@@ -541,6 +544,41 @@ mod tests {
assert!(c.is_null(1));
}
+ #[test]
+ fn test_map() {
+ let buf = r#"
+ {"map": {"a": ["foo", null]}}
+ {"map": {"a": [null], "b": []}}
+ {"map": {"c": null, "a": ["baz"]}}
+ "#;
+ let list = DataType::List(Box::new(Field::new("element",
DataType::Utf8, true)));
+ let entries = DataType::Struct(vec![
+ Field::new("key", DataType::Utf8, false),
+ Field::new("value", list, true),
+ ]);
+
+ let map = DataType::Map(Box::new(Field::new("entries", entries,
true)), false);
+ let schema = Arc::new(Schema::new(vec![Field::new("map", map, true)]));
+
+ let batches = do_read(buf, 1024, schema);
+ assert_eq!(batches.len(), 1);
+
+ let map = as_map_array(batches[0].column(0).as_ref());
+ let map_keys = as_string_array(map.keys().as_ref());
+ let map_values = as_list_array(map.values().as_ref());
+ assert_eq!(map.value_offsets(), &[0, 1, 3, 5]);
+
+ let k: Vec<_> = map_keys.iter().map(|x| x.unwrap()).collect();
+ assert_eq!(&k, &["a", "a", "b", "c", "a"]);
+
+ let list_values = as_string_array(map_values.values().as_ref());
+ let lv: Vec<_> = list_values.iter().collect();
+ assert_eq!(&lv, &[Some("foo"), None, None, Some("baz")]);
+ assert_eq!(map_values.value_offsets(), &[0, 2, 3, 3, 3, 4]);
+ assert_eq!(map_values.null_count(), 1);
+ assert!(map_values.is_null(3))
Review Comment:
I wonder if we can use our fancy new arrow display writer here to write out
the contents of the arrays as well 🤔
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