srowen commented on a change in pull request #27449:
[SPARK-27297][DOC][FOLLOW-UP] Improve documentation for various Scala functions
URL: https://github.com/apache/spark/pull/27449#discussion_r375385458
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File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
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@@ -3488,6 +3511,16 @@ object functions {
* Applies a binary operator to an initial state and all elements in the
array,
* and reduces this to a single state. The final state is converted into the
final result
* by applying a finish function.
+ * {{{
+ * df.select(aggregate(col("i"), lit(0), (acc, x) => acc + x, _ * 10))
+ * }}}
+ *
+ * @param expr the input array column
+ * @param zero the initial value
Review comment:
Hm, does that change the API? I forget when param names matter in Scala.
In any event, 'zero' isn't a terrible name as a reduce-like function needs a
'zero' value that is the result of no aggregation.
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