1fanwang commented on code in PR #10672:
URL: https://github.com/apache/arrow-rs/pull/10672#discussion_r3772611637
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arrow-string/src/substring.rs:
##########
@@ -1035,4 +1100,90 @@ mod tests {
let expected = BinaryArray::from(vec![Some(expected_bytes)]);
assert_eq!(expected, *actual);
}
+
+ /// The view result has to match the [`DataType::Utf8`] result for the
same input.
+ #[test]
+ fn string_view_matches_utf8() {
+ let values = vec![
+ Some("hello world"),
+ Some(""),
+ None,
+ Some("a"),
+ Some("this one is definitely longer than twelve bytes"),
+ ];
+ let utf8 = StringArray::from(values.clone());
+ let view = StringViewArray::from(values);
+
+ for (start, length) in [
+ (0, None),
+ (0, Some(0)),
+ (0, Some(5)),
+ (0, Some(1000)),
+ (1, Some(3)),
+ (5, None),
+ (100, Some(2)),
+ (100, None),
+ (-3, None),
+ (-3, Some(2)),
+ (-100, Some(4)),
+ (-100, None),
+ ] {
+ let expected = substring(&utf8, start, length).unwrap();
+ let expected = expected.as_string::<i32>();
+ let actual = substring(&view, start, length).unwrap();
+ let actual = actual.as_string_view();
+ assert_eq!(
+ expected.iter().collect::<Vec<_>>(),
+ actual.iter().collect::<Vec<_>>(),
+ "start={start} length={length:?}"
+ );
+ }
+ }
+
+ #[test]
+ fn binary_view_matches_binary() {
+ let values: Vec<Option<&[u8]>> = vec![Some(b"hello world"), Some(b""),
None, Some(b"abc")];
+ let binary = BinaryArray::from(values.clone());
+ let view = BinaryViewArray::from(values);
+
+ for (start, length) in [
+ (0, None),
+ (0, Some(5)),
+ (2, Some(3)),
+ (-3, None),
+ (100, Some(2)),
+ ] {
+ let expected = substring(&binary, start, length).unwrap();
+ let expected = expected.as_binary::<i32>();
+ let actual = substring(&view, start, length).unwrap();
+ let actual = actual.as_binary_view();
+ assert_eq!(
+ expected.iter().collect::<Vec<_>>(),
+ actual.iter().collect::<Vec<_>>(),
+ "start={start} length={length:?}"
+ );
+ }
+ }
+
+ #[test]
+ fn string_view_rejects_an_invalid_char_boundary() {
Review Comment:
Added in 336f3d5. It cross-checks `héllo wörld` and `日本語` against the Utf8
path on the offsets that are char boundaries in both, and asserts `substring(_,
0, 3)` gives `hé` and `日`.
Writing it caught my own bad offsets: `-4` lands mid-`ö`, and both paths
errored identically, which was reassuring.
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