Rich-T-kid commented on code in PR #10695:
URL: https://github.com/apache/arrow-rs/pull/10695#discussion_r3789604765
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arrow-schema/src/metadata.rs:
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@@ -445,6 +458,35 @@ mod tests {
assert_eq!(format!("{metadata:?}"), r#"{"a": "1", "b": "2"}"#);
assert_eq!(format!("{:?}", Metadata::new()), "{}");
}
+ #[test]
+ fn test_retain() {
+ let mut metadata =
+ Metadata::from([("a", "1"), ("b", "2"), ("c", "3"), ("d", "4"),
("e", "5")]);
+
+ metadata.retain(|k, _| -> bool { k >= &String::from("c") });
+
+ let result_map = Metadata::from([("c", "3"), ("d", "4"), ("e", "5")]);
+ assert_eq!(metadata, result_map)
+ }
+
+ #[test]
Review Comment:
also added a test for when `retain()` clears all the maps contents. the
metadata becomes `None`
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