alamb commented on code in PR #6905:
URL: https://github.com/apache/arrow-rs/pull/6905#discussion_r1903093540
##########
arrow-csv/src/reader/mod.rs:
##########
@@ -1284,7 +1284,7 @@ mod tests {
assert_eq!("53.002666", lat.value_as_string(1));
assert_eq!("52.412811", lat.value_as_string(2));
assert_eq!("51.481583", lat.value_as_string(3));
- assert_eq!("12.123456", lat.value_as_string(4));
+ assert_eq!("12.123457", lat.value_as_string(4));
Review Comment:
I personally wouldn't characterize this a breaking change, though I can see
how others might.
In my opinion, adding a parameter to choose between the behaviors would be
the safest thing (aka a field to `CastOptions` that defaults to the old,
rounding, behavior) for
https://docs.rs/arrow/latest/arrow/compute/kernels/cast/fn.cast_with_options.html
Maybe @liukun4515 who added much of the initial decimal support in arrow-rs
has time to offer historical perspective on rounding vs truncation during
casting?
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