findepi commented on code in PR #16856:
URL: https://github.com/apache/datafusion/pull/16856#discussion_r2225777623
##########
datafusion/functions/src/string/chr.rs:
##########
@@ -132,3 +134,79 @@ impl ScalarUDFImpl for ChrFunc {
self.doc()
}
}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use arrow::array::{Array, Int64Array, StringArray};
+ use datafusion_common::assert_contains;
+
+ #[test]
+ fn test_chr_normal() {
+ let input = Arc::new(Int64Array::from(vec![
+ Some(65), // A
+ Some(66), // B
+ Some(67), // C
+ Some(128640), // 🚀
+ Some(8364), // €
+ Some(945), // α
+ None, // NULL
+ Some(32), // space
+ Some(10), // newline
+ Some(9), // tab
+ ]));
+ let result = chr(&[input]).unwrap();
+ let string_array =
result.as_any().downcast_ref::<StringArray>().unwrap();
+ let expected = ["A", "B", "C", "🚀", "€", "α", "", " ", "\n", "\t"];
+
+ assert_eq!(string_array.len(), 10);
+ for (i, e) in expected.iter().enumerate() {
+ assert_eq!(string_array.value(i), *e);
+ }
+ }
+
+ #[test]
+ fn test_chr_error() {
+ // chr(0) returns an error
+ let input = Arc::new(Int64Array::from(vec![0]));
+ let result = chr(&[input]);
+ assert!(result.is_err());
+ assert_contains!(
+ result.err().unwrap().to_string(),
+ "null character not permitted"
+ );
+
+ // invalid Unicode code points (too large)
+ let input = Arc::new(Int64Array::from(vec![i64::MAX]));
+ let result = chr(&[input]);
+ assert!(result.is_err());
+ assert_contains!(
+ result.err().unwrap().to_string(),
+ "requested character too large for encoding"
+ );
+
+ // negative input
+ let input = Arc::new(Int64Array::from(vec![i64::MIN + 2i64])); // will
be 2 if cast to u32
+ let result = chr(&[input]);
+ assert!(result.is_err());
+ assert_contains!(
+ result.err().unwrap().to_string(),
+ "negative input not permitted"
+ );
+
+ // one error with valid values after
+ let input = Arc::new(Int64Array::from(vec![65, 0, 66])); // A,
NULL_CHAR, B
+ let result = chr(&[input]);
+ assert!(result.is_err());
+ assert_contains!(
+ result.err().unwrap().to_string(),
+ "null character not permitted"
Review Comment:
yes, i know
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org
For additional commands, e-mail: github-h...@datafusion.apache.org
