dongjoon-hyun commented on a change in pull request #24895: [MINOR][DOC] Fix
python variance() documentation
URL: https://github.com/apache/spark/pull/24895#discussion_r294373063
##########
File path: python/pyspark/sql/functions.py
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@@ -215,7 +215,7 @@ def _():
' the expression in a group.',
'stddev_pop': 'Aggregate function: returns population standard deviation
of' +
' the expression in a group.',
- 'variance': 'Aggregate function: returns the population variance of the
values in a group.',
+ 'variance': 'Aggregate function: returns the unbiased variance of the
values in a group.',
'var_samp': 'Aggregate function: returns the unbiased variance of the
values in a group.',
Review comment:
Shall we add `unbiased sample variance` like the following two sentences?
```
'variance': 'Aggregate function: returns the unbiased sample variance of the
values in a group.',
'var_samp': 'Aggregate function: returns the unbiased sample variance of the
values in a group.',
```
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