Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/15487#discussion_r83470770
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Last.scala
---
@@ -29,15 +29,18 @@ import org.apache.spark.sql.types._
* a single partition, and we use a single reducer to do the aggregation.).
*/
@ExpressionDescription(
- usage = "_FUNC_(expr,isIgnoreNull) - Returns the last value of `child`
for a group of rows.")
+ usage = """_FUNC_(expr,isIgnoreNull) - Returns the last value of `child`
for a group of rows.
+ _FUNC_(expr,isIgnoreNull=false) - Returns the last value of `child`
for a group of rows.
--- End diff --
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