fix: trunc function with precision uses round instead of trunc semantics#19794
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Jefffrey merged 2 commits intoapache:mainfrom Jan 16, 2026
Merged
fix: trunc function with precision uses round instead of trunc semantics#19794Jefffrey merged 2 commits intoapache:mainfrom
Jefffrey merged 2 commits intoapache:mainfrom
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| assert_eq!(floats.len(), 5); | ||
| assert_eq!(floats.value(0), 15.0); | ||
| assert_eq!(floats.value(1), 1_234.268); |
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why is this assertion removed ?
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Oops, I might have accidently deleted the line during editing.
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Jan 15, 2026
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Thanks @kumarUjjawal & @martin-g |
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…ics (apache#19794) ## Which issue does this PR close? <!-- We generally require a GitHub issue to be filed for all bug fixes and enhancements and this helps us generate change logs for our releases. You can link an issue to this PR using the GitHub syntax. For example `Closes apache#123` indicates that this PR will close issue apache#123. --> - Closes apache#19793. ## Rationale for this change The helper functions `compute_truncate32` and `compute_truncate64` incorrectly use `.round()` instead of `.trunc()`, causing incorrect results: - `trunc(3.76, 1)` returned `3.8` (wrong - rounded) - `trunc(3.76, 1)` should return `3.7` (correct - truncated) <!-- Why are you proposing this change? If this is already explained clearly in the issue then this section is not needed. Explaining clearly why changes are proposed helps reviewers understand your changes and offer better suggestions for fixes. --> ## What changes are included in this PR? - Change `.round()` to `.trunc()` in `compute_truncate32` and `compute_truncate64` - Update unit test expected values to reflect correct truncation behavior <!-- There is no need to duplicate the description in the issue here but it is sometimes worth providing a summary of the individual changes in this PR. --> ## Are these changes tested? Yes. Unit tests updated and pass. <!-- We typically require tests for all PRs in order to: 1. Prevent the code from being accidentally broken by subsequent changes 2. Serve as another way to document the expected behavior of the code If tests are not included in your PR, please explain why (for example, are they covered by existing tests)? --> ## Are there any user-facing changes? <!-- If there are user-facing changes then we may require documentation to be updated before approving the PR. --> <!-- If there are any breaking changes to public APIs, please add the `api change` label. -->
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Which issue does this PR close?
roundinstead oftruncsemantics #19793.Rationale for this change
The helper functions
compute_truncate32andcompute_truncate64incorrectly use.round()instead of.trunc(), causing incorrect results:trunc(3.76, 1)returned3.8(wrong - rounded)trunc(3.76, 1)should return3.7(correct - truncated)What changes are included in this PR?
.round()to.trunc()incompute_truncate32andcompute_truncate64Are these changes tested?
Yes. Unit tests updated and pass.
Are there any user-facing changes?