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Posted to github@arrow.apache.org by "choksi2212 (via GitHub)" <gi...@apache.org> on 2026/10/15 22:20:14 UTC
[PR] fix(arrow-array): return overflow error instead of panicking when negating `i32::MIN` months [arrow-rs]
choksi2212 opened a new pull request, #11611:
URL: https://github.com/apache/arrow-rs/pull/11611
# Which issue does this PR close?
- Closes #11600
# Rationale for this change
`Date32Type`/`Date64Type`::`subtract_year_months_opt` and `subtract_month_day_nano_opt` negate the interval months with a unary minus before handing them to `add_months_date`. When the months are `i32::MIN` the negation itself overflows, so in debug builds the `_opt` helpers panic instead of returning `None`:
```
thread panicked at arrow-array/src/types.rs:1143:55:
attempt to negate with overflow
```
Every other out-of-range date arithmetic returns `None` from the `_opt` helpers, which `date_op` surfaces as `Date arithmetic overflow`. The timestamp kernels already handle `i32::MIN` months (`sub_months_datetime` subtracts through `unsigned_abs`), so only these four date helpers were affected.
# What changes are included in this PR?
The four negations now use `checked_neg()`, so the negation overflow returns `None` and the kernels report the same `Date arithmetic overflow` error as any other interval that moves the date out of range:
- `Date32Type::subtract_year_months_opt`
- `Date32Type::subtract_month_day_nano_opt`
- `Date64Type::subtract_year_months_opt`
- `Date64Type::subtract_month_day_nano_opt`
`add_months_date` is untouched — it already handles months of any magnitude via `unsigned_abs`.
# Are there any user-facing changes?
No API changes. Subtracting an `i32::MIN`-months interval from a `Date32`/`Date64` array no longer panics in debug builds; it returns the existing `Date arithmetic overflow` error, matching the already-correct behavior of every other out-of-range interval.
One note on release builds (overflow checks off): the wrapped `-i32::MIN` still lands in `add_months_date`'s `unsigned_abs` branch, which returns `None` for a ~179-million-year shift, so release builds were already reporting the overflow error. That part is reasoned from the code; everything below is from actual runs.
# Testing
- New kernel-level test `test_date_sub_interval_min_months` covers the repro from the issue for all four type/interval combinations and asserts the `Date arithmetic overflow` error. On unpatched `main` it panics with `attempt to negate with overflow` at `arrow-array/src/types.rs:1143:55`; with this patch it passes.
- `test_year_month_ops!` and `test_month_day_nano_ops!` gain `i32::MIN` cases for both `Date32Type` and `Date64Type`: subtract must return `None`, and the corresponding `add` with `i32::MIN` months is pinned as the out-of-range control.
- `cargo test -p arrow-arith`: 256 passed, 0 failed. `cargo test -p arrow-array`: 946 passed, 0 failed. `cargo fmt --all -- --check` and `cargo clippy -p arrow-arith -p arrow-array --all-targets` clean (rustc 1.99.0, Linux).
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Re: [PR] fix(arrow-array): return overflow error instead of panicking when negating `i32::MIN` months [arrow-rs]
Posted by "choksi2212 (via GitHub)" <gi...@apache.org>.
choksi2212 commented on PR #11611:
URL: https://github.com/apache/arrow-rs/pull/11611#issuecomment-6405318195
One CI logistics note: `CI (fork)` on this PR is still waiting on an Approve-and-run click from someone with permissions (first PR from my fork to arrow-rs). Happy to rebase or adjust anything once it actually runs.
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Re: [PR] fix(arrow-array): return overflow error instead of panicking when negating `i32::MIN` months [arrow-rs]
Posted by "choksi2212 (via GitHub)" <gi...@apache.org>.
choksi2212 commented on PR #11611:
URL: https://github.com/apache/arrow-rs/pull/11611#issuecomment-6440938259
Thanks for the review and the merge!
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Re: [PR] fix(arrow-array): return overflow error instead of panicking when negating `i32::MIN` months [arrow-rs]
Posted by "choksi2212 (via GitHub)" <gi...@apache.org>.
choksi2212 commented on code in PR #11611:
URL: https://github.com/apache/arrow-rs/pull/11611#discussion_r4305219977
##########
arrow-array/src/types.rs:
##########
@@ -1140,7 +1140,7 @@ impl Date32Type {
delta: <IntervalYearMonthType as ArrowPrimitiveType>::Native,
) -> Option<<Date32Type as ArrowPrimitiveType>::Native> {
let prior = Date32Type::to_naive_date_opt(date)?;
- let months = IntervalYearMonthType::to_months(-delta);
+ let months = IntervalYearMonthType::to_months(delta.checked_neg()?);
Review Comment:
Done in a19611c — added the comment at all four sites. Kept it to two lines each: `-i32::MIN` overflows `i32`, but a 2^31-month shift is outside `NaiveDate`'s range anyway, so `None` is the right answer regardless.
Re-verified locally on the updated tree: `cargo test -p arrow-arith --lib` 256 passed / 0 failed (incl. the updated kernel test), the moved type-level test passes under `arrow-array`, `cargo fmt --all --check` and `cargo clippy` are clean.
##########
arrow-arith/src/numeric.rs:
##########
@@ -2862,4 +2894,42 @@ mod tests {
test_month_day_nano_ops!(Date32Type, date_to_days);
test_month_day_nano_ops!(Date64Type, date_to_millis);
}
+
+ #[test]
+ fn test_date_sub_interval_min_months() {
+ // Subtracting i32::MIN months requires negating i32::MIN, which
+ // overflows i32: the date kernels must return the Date arithmetic
+ // overflow error instead of panicking in debug builds
+ // https://github.com/apache/arrow-rs/issues/11600
+ let dates = Date32Array::from(vec![0]);
+ let deltas = IntervalYearMonthArray::from(vec![i32::MIN]);
+ let err = sub(&dates, &deltas).unwrap_err();
+ assert!(
+ err.to_string().contains("Date arithmetic overflow"),
+ "unexpected error: {err}"
+ );
+
+ let dates = Date64Array::from(vec![0]);
+ let err = sub(&dates, &deltas).unwrap_err();
+ assert!(
+ err.to_string().contains("Date arithmetic overflow"),
+ "unexpected error: {err}"
+ );
+
+ let deltas =
+ IntervalMonthDayNanoArray::from(vec![IntervalMonthDayNano::new(i32::MIN, 0, 0)]);
+ let dates = Date32Array::from(vec![0]);
+ let err = sub(&dates, &deltas).unwrap_err();
+ assert!(
+ err.to_string().contains("Date arithmetic overflow"),
+ "unexpected error: {err}"
+ );
+
+ let dates = Date64Array::from(vec![0]);
+ let err = sub(&dates, &deltas).unwrap_err();
+ assert!(
+ err.to_string().contains("Date arithmetic overflow"),
+ "unexpected error: {err}"
+ );
Review Comment:
Done in a19611c — the kernel test now asserts the full error message for both the `IntervalYearMonth` and `IntervalMonthDayNano` deltas, on both `Date32` and `Date64`, so a failure from a different operand or operation can no longer pass it.
##########
arrow-arith/src/numeric.rs:
##########
@@ -2625,6 +2625,18 @@ mod tests {
<$type>::add_year_months_opt($date_fn(MIN_VALID_DATE), -1).is_none(),
"add_year_months: overflow neg days"
);
+
+ // Negating i32::MIN months overflows i32: subtract must return
+ // None (reported as a Date arithmetic overflow by the kernels)
+ // instead of panicking in debug builds
+ assert!(
Review Comment:
Done in a19611c — moved those to `types.rs` as `date_subtract_i32_min_months_overflows`, next to the `*_opt` implementations they exercise.
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Re: [PR] fix(arrow-array): return overflow error instead of panicking when negating `i32::MIN` months [arrow-rs]
Posted by "Jefffrey (via GitHub)" <gi...@apache.org>.
Jefffrey merged PR #11611:
URL: https://github.com/apache/arrow-rs/pull/11611
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Re: [PR] fix(arrow-array): return overflow error instead of panicking when negating `i32::MIN` months [arrow-rs]
Posted by "Jefffrey (via GitHub)" <gi...@apache.org>.
Jefffrey commented on code in PR #11611:
URL: https://github.com/apache/arrow-rs/pull/11611#discussion_r4301901040
##########
arrow-arith/src/numeric.rs:
##########
@@ -2625,6 +2625,18 @@ mod tests {
<$type>::add_year_months_opt($date_fn(MIN_VALID_DATE), -1).is_none(),
"add_year_months: overflow neg days"
);
+
+ // Negating i32::MIN months overflows i32: subtract must return
+ // None (reported as a Date arithmetic overflow by the kernels)
+ // instead of panicking in debug builds
+ assert!(
Review Comment:
these tests seem like theyd be more suited to be alongside types.rs, where the functions being tested are defined
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Re: [PR] fix(arrow-array): return overflow error instead of panicking when negating `i32::MIN` months [arrow-rs]
Posted by "mbutrovich (via GitHub)" <gi...@apache.org>.
mbutrovich commented on code in PR #11611:
URL: https://github.com/apache/arrow-rs/pull/11611#discussion_r4299039276
##########
arrow-arith/src/numeric.rs:
##########
@@ -2862,4 +2894,42 @@ mod tests {
test_month_day_nano_ops!(Date32Type, date_to_days);
test_month_day_nano_ops!(Date64Type, date_to_millis);
}
+
+ #[test]
+ fn test_date_sub_interval_min_months() {
+ // Subtracting i32::MIN months requires negating i32::MIN, which
+ // overflows i32: the date kernels must return the Date arithmetic
+ // overflow error instead of panicking in debug builds
+ // https://github.com/apache/arrow-rs/issues/11600
+ let dates = Date32Array::from(vec![0]);
+ let deltas = IntervalYearMonthArray::from(vec![i32::MIN]);
+ let err = sub(&dates, &deltas).unwrap_err();
+ assert!(
+ err.to_string().contains("Date arithmetic overflow"),
+ "unexpected error: {err}"
+ );
+
+ let dates = Date64Array::from(vec![0]);
+ let err = sub(&dates, &deltas).unwrap_err();
+ assert!(
+ err.to_string().contains("Date arithmetic overflow"),
+ "unexpected error: {err}"
+ );
+
+ let deltas =
+ IntervalMonthDayNanoArray::from(vec![IntervalMonthDayNano::new(i32::MIN, 0, 0)]);
+ let dates = Date32Array::from(vec![0]);
+ let err = sub(&dates, &deltas).unwrap_err();
+ assert!(
+ err.to_string().contains("Date arithmetic overflow"),
+ "unexpected error: {err}"
+ );
+
+ let dates = Date64Array::from(vec![0]);
+ let err = sub(&dates, &deltas).unwrap_err();
+ assert!(
+ err.to_string().contains("Date arithmetic overflow"),
+ "unexpected error: {err}"
+ );
Review Comment:
What do you think about asserting the full error message, like the other kernel overflow tests in this file do ([numeric.rs](https://github.com/apache/arrow-rs/blob/3ef09c668303f46da22a56373bd125a320fecf3b/arrow-arith/src/numeric.rs#L1387-L1395))? `contains("Date arithmetic overflow")` would also pass if the error came from a different operand or operation. The full message also checks that the error reports the operands the caller passed. Looping over the two date arrays keeps the test short.
```suggestion
let dates: [ArrayRef; 2] = [
Arc::new(Date32Array::from(vec![0])),
Arc::new(Date64Array::from(vec![0])),
];
let year_month = IntervalYearMonthArray::from(vec![i32::MIN]);
let month_day_nano =
IntervalMonthDayNanoArray::from(vec![IntervalMonthDayNano::new(i32::MIN, 0, 0)]);
for dates in &dates {
assert_eq!(
sub(dates, &year_month).unwrap_err().to_string(),
"Compute error: Date arithmetic overflow: 0 - -2147483648 months"
);
assert_eq!(
sub(dates, &month_day_nano).unwrap_err().to_string(),
"Compute error: Date arithmetic overflow: 0 - IntervalMonthDayNano { months: -2147483648, days: 0, nanoseconds: 0 }"
);
}
```
##########
arrow-array/src/types.rs:
##########
@@ -1140,7 +1140,7 @@ impl Date32Type {
delta: <IntervalYearMonthType as ArrowPrimitiveType>::Native,
) -> Option<<Date32Type as ArrowPrimitiveType>::Native> {
let prior = Date32Type::to_naive_date_opt(date)?;
- let months = IntervalYearMonthType::to_months(-delta);
+ let months = IntervalYearMonthType::to_months(delta.checked_neg()?);
Review Comment:
Should we add a short comment here and at the other three `checked_neg()?` sites (lines 1229, 1333, and 1371)? A reader could take `checked_neg()?` as rejecting a subtraction that should succeed. As I read it, `None` is the right answer because a shift of 2^31 months (about 179 million years) is far outside the range of `NaiveDate`, which runs from year -262143 to 262142 ([numeric.rs](https://github.com/apache/arrow-rs/blob/3ef09c668303f46da22a56373bd125a320fecf3b/arrow-arith/src/numeric.rs#L1183)). The subtraction would overflow even if the negation didn't.
```suggestion
// -i32::MIN overflows i32, but a 2^31 month shift is outside NaiveDate's range anyway
let months = IntervalYearMonthType::to_months(delta.checked_neg()?);
```
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Re: [PR] fix(arrow-array): return overflow error instead of panicking when negating `i32::MIN` months [arrow-rs]
Posted by "choksi2212 (via GitHub)" <gi...@apache.org>.
choksi2212 commented on PR #11611:
URL: https://github.com/apache/arrow-rs/pull/11611#issuecomment-6401086659
Following up on this one — the review feedback from mbutrovich and Jefffrey is applied at a19611c and the CI suites came back green. A review pass when someone has a cycle would be appreciated.
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