[fix](doc) log10.md: NaN / 0 / negative inputs return NULL, not NaN#3809
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[fix](doc) log10.md: NaN / 0 / negative inputs return NULL, not NaN#3809boluor wants to merge 1 commit into
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…t NaN
Both the EN page (in the example block) and both pages (in the return-
value spec) claimed that log10 of NaN returns NaN. On Apache Doris
4.1.1 the cluster actually returns NULL for log10 of NaN, log10 of 0,
and log10 of negative numbers. Update:
- EN: change the example's expected output `NaN` -> `NULL`.
- EN + ZH: rewrite the return-value bullet to cover NaN / zero /
negative all returning NULL.
Verified on the cluster:
log10(cast('nan' as double)) -> NULL
log10(0.0) -> NULL
log10(-1) -> NULL
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Doc page (4.x): `scalar-functions/numeric-functions/log10.md` (EN + ZH).
Both pages claimed in their Return Value section, and the EN page additionally claimed in its example block, that `log10(NaN)` returns `NaN`. On Apache Doris 4.1.1 the cluster actually returns `NULL`. The same applies to `log10(0)` and `log10()`.
Update:
Verification
```
mysql> select log10(cast('nan' as double)); -- NULL
mysql> select log10(0.0); -- NULL
mysql> select log10(-1); -- NULL
mysql> select cast('nan' as double); -- NaN (the cast itself preserves NaN; log10 consumes it and returns NULL)
```
Test plan
🤖 Generated with Claude Code