Weijun-H opened a new issue, #12249:
URL: https://github.com/apache/datafusion/issues/12249
### Is your feature request related to a problem or challenge?
Returns the skewness value calculated from values of a group.
### Describe the solution you'd like
```
> SELECT skewness(col) FROM VALUES (-10), (-20), (100), (1000), (1000) AS
tab(col);
0.3853941073355022
> SELECT skewness(DISTINCT col) FROM VALUES (-10), (-20), (100), (1000),
(1000) AS tab(col);
1.1135657469022011
> SELECT skewness(col) FROM VALUES (-1000), (-100), (10), (20) AS tab(col);
-1.1135657469022011
```
### Describe alternatives you've considered
_No response_
### Additional context
https://docs.databricks.com/en/sql/language-manual/functions/skewness.html
https://duckdb.org/docs/sql/functions/aggregates#skewnessx
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