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Commit 6f6bb0e8 authored by Yanbo Liang's avatar Yanbo Liang Committed by Reynold Xin
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[SPARK-12011][SQL] Stddev/Variance etc should support columnName as arguments 

Spark SQL aggregate function:
```Java
stddev
stddev_pop
stddev_samp
variance
var_pop
var_samp
skewness
kurtosis
collect_list
collect_set
```
should support ```columnName``` as arguments like other aggregate function(max/min/count/sum).

Author: Yanbo Liang <ybliang8@gmail.com>

Closes #9994 from yanboliang/SPARK-12011.
parent 0c1e72e7
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