Jefffrey commented on code in PR #19409:
URL: https://github.com/apache/datafusion/pull/19409#discussion_r2639582655
##########
datafusion/functions/src/math/log.rs:
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@@ -118,13 +118,18 @@ fn log_decimal32(value: i32, scale: i8, base: f64) ->
Result<f64, ArrowError> {
)));
}
- let unscaled_value = decimal32_to_i32(value, scale)?;
- if unscaled_value > 0 {
+ // Match f64::log behaviour
+ if value <= 0 {
+ return Ok(f64::NAN);
+ }
+
+ if scale < 0 {
+ let actual_value = (value as f64) * 10.0_f64.powi(-(scale as i32));
+ Ok(actual_value.log(base))
+ } else {
+ let unscaled_value = decimal32_to_i32(value, scale)?;
let log_value: u32 = unscaled_value.ilog(base as i32);
Review Comment:
I thought we return NaN for these cases?
Could we also add a test to check this behaviour
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