Function test_string_view

arrow-array/src/builder/generic_bytes_view_builder.rs:810–889

()

    #[test]
    fn test_string_view() {
        let b1 = Buffer::from(b"world\xFFbananas\xF0\x9F\x98\x81");
        let b2 = Buffer::from(b"cupcakes");
        let b3 = Buffer::from(b"Many strings are here contained of great length and verbosity");

        let mut v = StringViewBuilder::new();
        assert_eq!(v.append_block(b1), 0);

        v.append_value("This is a very long string that exceeds the inline length");
        v.append_value("This is another very long string that exceeds the inline length");

        assert_eq!(v.append_block(b2), 2);
        assert_eq!(v.append_block(b3), 3);

        // Test short strings
        v.try_append_view(0, 0, 5).unwrap(); // world
        v.try_append_view(0, 6, 7).unwrap(); // bananas
        v.try_append_view(2, 3, 5).unwrap(); // cake
        v.try_append_view(2, 0, 3).unwrap(); // cup
        v.try_append_view(2, 0, 8).unwrap(); // cupcakes
        v.try_append_view(0, 13, 4).unwrap(); // 😁
        v.try_append_view(0, 13, 0).unwrap(); //

        // Test longer strings
        v.try_append_view(3, 0, 16).unwrap(); // Many strings are
        v.try_append_view(1, 0, 19).unwrap(); // This is a very long
        v.try_append_view(3, 13, 27).unwrap(); // here contained of great length

        v.append_value("I do so like long strings");

        let array = v.finish_cloned();
        array.to_data().validate_full().unwrap();
        assert_eq!(array.data_buffers().len(), 5);
        let actual: Vec<_> = array.iter().flatten().collect();
        assert_eq!(
            actual,
            &[
                "This is a very long string that exceeds the inline length",
                "This is another very long string that exceeds the inline length",
                "world",
                "bananas",
                "cakes",
                "cup",
                "cupcakes",
                "😁",
                "",
                "Many strings are",
                "This is a very long",
                "are here contained of great",
                "I do so like long strings"
            ]
        );

        let err = v.try_append_view(0, u32::MAX, 1).unwrap_err();
        assert_eq!(
            err.to_string(),
            "Invalid argument error: Range 4294967295..4294967296 out of bounds for block of length 17"
        );