[common] Fix FLOAT precision checking. (#4656)#4658
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Dec 8, 2024
| throw new NumberFormatException( | ||
| s + " cannot be cast to float due to precision loss"); | ||
| } else { | ||
| // Validate precision by comparing the rounded value |
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float f = Float.parseFloat(s);
| s + " cannot be cast to float due to precision loss"); | ||
| } else { | ||
| // Validate precision by comparing the rounded value | ||
| if ((double) f == d || Math.abs(f - d) < Math.abs(d * 1e-6)) { |
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why use "d * 1e-6"?
what about Double#compare?
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- The value 1e-6 (which is 0.000001) is typically a reasonable threshold for floating-point comparisons, it's a balance between precision and practical usability.
- This approach helps avoid rejecting values that are within the acceptable precision for FLOAT types in databases like MySQL, while still accounting for the limitations of floating-point precision.
| } else { | ||
| // Significant precision loss detected | ||
| throw new NumberFormatException( | ||
| s + " cannot be cast to FLOAT due to precision loss"); |
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The exception message need improve. It needs to cover the comparative failure situation.
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This pull request has had no activity for 90 days and is being marked stale. If you'd like to keep it open, please leave a comment or push a new commit. Thank you for your contribution to Apache Paimon! |
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Purpose
Linked issue: close #4656
Tests
API and Format
Documentation