zhengruifeng opened a new pull request, #36549: URL: https://github.com/apache/spark/pull/36549
### What changes were proposed in this pull request? the logics of computing skewness are different between spark sql and pandas: spark sql: [`sqrt(n) * m3 / sqrt(m2 * m2 * m2))`](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CentralMomentAgg.scala#L304) pandas: [`(count * (count - 1) ** 0.5 / (count - 2)) * (m3 / m2**1.5)`](https://github.com/pandas-dev/pandas/blob/main/pandas/core/nanops.py#L1221) ### Why are the changes needed? to make skew consistent with pandas ### Does this PR introduce _any_ user-facing change? yes, the logic to compute skew was changed ### How was this patch tested? added UT -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
