andygrove commented on code in PR #552:
URL: https://github.com/apache/datafusion-comet/pull/552#discussion_r1634870782
##########
core/src/execution/datafusion/expressions/scalar_funcs/chr.rs:
##########
@@ -44,10 +44,18 @@ pub fn chr(args: &[ArrayRef]) -> Result<ArrayRef> {
.iter()
.map(|integer: Option<i64>| {
integer
- .map(|integer| match core::char::from_u32(integer as u32) {
- Some(integer) => Ok(integer.to_string()),
- None => {
- exec_err!("requested character too large for
encoding.")
+ .map(|integer| {
+ let adjusted_integer = if integer >= 0 { integer % 256 }
else { integer };
+
+ match core::char::from_u32(adjusted_integer as u32) {
+ Some(integer) => Ok(integer.to_string()),
+ None => {
+ if integer < 0 {
Review Comment:
nit: could you check for negative integers earlier, before calling
`core::char::from_u32(adjusted_integer as u32)`. If the input is a negative
number then we should not attempt to convert to a char.
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