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Posted to github@datafusion.apache.org by "lyne7-sc (via GitHub)" <gi...@apache.org> on 2026/08/11 07:52:42 UTC
[PR] fix: preserve NULL semantics in `log` and `power` simplification [datafusion]
lyne7-sc opened a new pull request, #24247:
URL: https://github.com/apache/datafusion/pull/24247
## Which issue does this PR close?
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- Part of #24246.
## Rationale for this change
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Explaining clearly why changes are proposed helps reviewers understand your changes and offer better suggestions for fixes.
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For example, "The code in `foo.rs` doesn't handle nulls" is a symptom of the
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nulls" is the user-visible problem.
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`log` and `power` simplifications removed a nullable base expression, which could incorrectly produce a non-NULL result when the base was NULL.
For example:
```sql
SELECT log(a, 1.0), power(a, 0.0)
FROM (VALUES (NULL::DOUBLE)) AS t(a);
```
These expressions should both return NULL, but simplification could replace them with 0.0 and 1.0.
## What changes are included in this PR?
only apply these simplifications when the removed base expression is non-nullable.
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## Are these changes tested?
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Yes. Added sqllogictests covering results and plans.
## Are there any user-facing changes?
Yes. log and power expressions with nullable bases now correctly preserve NULLs.
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Re: [PR] fix: preserve NULL semantics in `log` and `power` simplification [datafusion]
Posted by "codecov-commenter (via GitHub)" <gi...@apache.org>.
codecov-commenter commented on PR #24247:
URL: https://github.com/apache/datafusion/pull/24247#issuecomment-5250738378
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:x: Patch coverage is `69.23077%` with `4 lines` in your changes missing coverage. Please review.
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|---|---|---|
| [datafusion/functions/src/math/log.rs](https://app.codecov.io/gh/apache/datafusion/pull/24247?src=pr&el=tree&filepath=datafusion%2Ffunctions%2Fsrc%2Fmath%2Flog.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache#diff-ZGF0YWZ1c2lvbi9mdW5jdGlvbnMvc3JjL21hdGgvbG9nLnJz) | 71.42% | [0 Missing and 2 partials :warning: ](https://app.codecov.io/gh/apache/datafusion/pull/24247?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) |
| [datafusion/functions/src/math/power.rs](https://app.codecov.io/gh/apache/datafusion/pull/24247?src=pr&el=tree&filepath=datafusion%2Ffunctions%2Fsrc%2Fmath%2Fpower.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache#diff-ZGF0YWZ1c2lvbi9mdW5jdGlvbnMvc3JjL21hdGgvcG93ZXIucnM=) | 66.66% | [0 Missing and 2 partials :warning: ](https://app.codecov.io/gh/apache/datafusion/pull/24247?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) |
<details><summary>Additional details and impacted files</summary>
```diff
@@ Coverage Diff @@
## main #24247 +/- ##
==========================================
- Coverage 81.06% 81.01% -0.05%
==========================================
Files 1106 1106
Lines 382252 383982 +1730
Branches 382252 383982 +1730
==========================================
+ Hits 309861 311080 +1219
- Misses 54083 54561 +478
- Partials 18308 18341 +33
```
</details>
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Re: [PR] fix: preserve NULL semantics in `log` and `power` simplification [datafusion]
Posted by "Jefffrey (via GitHub)" <gi...@apache.org>.
Jefffrey commented on PR #24247:
URL: https://github.com/apache/datafusion/pull/24247#issuecomment-5263534845
thanks @lyne7-sc & @alamb
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Re: [PR] fix: preserve NULL semantics in `log` and `power` simplification [datafusion]
Posted by "Jefffrey (via GitHub)" <gi...@apache.org>.
Jefffrey merged PR #24247:
URL: https://github.com/apache/datafusion/pull/24247
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