Weijun-H opened a new issue, #12251:
URL: https://github.com/apache/datafusion/issues/12251

   ### Is your feature request related to a problem or challenge?
   
   The excess kurtosis (Fisher’s definition) without bias correction.
   
   ### Describe the solution you'd like
   
   ```D SELECT kurtosis_pop(col) FROM VALUES (1), (10), (100), (10), (1) as 
tab(col);
   ┌─────────────────────┐
   │  kurtosis_pop(col)  │
   │       double        │
   ├─────────────────────┤
   │ 0.19432323191699075 │
   └─────────────────────┘
   ```
   
   ### Describe alternatives you've considered
   
   _No response_
   
   ### Additional context
   
   https://duckdb.org/docs/sql/functions/aggregates#kurtosis_popx
   
https://clickhouse.com/docs/en/sql-reference/aggregate-functions/reference/kurtpop


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