Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9994#discussion_r46014608
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameAggregateSuite.scala ---
@@ -261,6 +261,9 @@ class DataFrameAggregateSuite extends QueryTest with
SharedSQLContext {
checkAnswer(
testData2.agg(stddev('a), stddev_pop('a), stddev_samp('a)),
Row(testData2ADev, math.sqrt(4 / 6.0), testData2ADev))
+ checkAnswer(
+ testData2.agg(stddev("a"), stddev_pop("a"), stddev_samp("a")),
--- End diff --
you can technically just include this in the previous checkanswer.
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