realno opened a new pull request #1525:
URL: https://github.com/apache/arrow-datafusion/pull/1525
# Which issue does this PR close?
This PR covers one of the functions (stddev) in #1486
# Rationale for this change
This change is to add functions to calculate standard deviation and variance
to DataFusion.
# What changes are included in this PR?
Two aggregation functions `variance` and `stddev` are added to DataFusion.
Also added some arithmetic functions (add, mul and div) to `ScalarValue`
since they are likely to be commonly used by many other operators. There are
limitations to the current form of the functions - please see the code. It may
be worth creating a new issue to capture the work properly.
# Are there any user-facing changes?
No change to existing functionalities or APIs. Two new functions are added
and are available through SQL interface.
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