fix: Panic/correctness issue in variance GroupsAccumulator#12615
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alamb merged 1 commit intoapache:mainfrom Sep 25, 2024
Merged
fix: Panic/correctness issue in variance GroupsAccumulator#12615alamb merged 1 commit intoapache:mainfrom
alamb merged 1 commit intoapache:mainfrom
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The bug was in the orginal implementation in apache#12095. This fixes the issue and modify a test case such that it would have caught it.
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Sep 25, 2024
| if let StatsType::Sample = self.stats_type { | ||
| counts.iter_mut().for_each(|count| { | ||
| *count -= 1; | ||
| *count = count.saturating_sub(1); |
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Should we return error if count is already 0?
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No, I think producing null is the expected behavior. Note that we use the counts to calculate the null array after this.
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Thanks @eejbyfeldt and @jayzhan211 |
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The bug was in the orginal implementation in apache#12095. This fixes the issue and modify a test case such that it would have caught it.
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Which issue does this PR close?
Closes #12616.
Rationale for this change
The bug was in the orginal implementation in #12095. This fixes the
issue and modify a test case such that it would have caught it.
Current code panics in debug builds and produces incorrect results in release.
What changes are included in this PR?
Use
staturating_subinstead to correct the behavior.Are these changes tested?
Modified test case.
Are there any user-facing changes?
No,