Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21045#discussion_r193976101
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -128,6 +128,173 @@ case class MapKeys(child: Expression)
override def prettyName: String = "map_keys"
}
+@ExpressionDescription(
+ usage = """_FUNC_(a1, a2, ...) - Returns a merged array containing in
the N-th position the
+ N-th value of each array given.""",
--- End diff --
I would do this:
```
usage = """
_FUNC_(a1, a2, ...) - Returns a merged array containing in the N-th
position the
N-th value of each array given.
"""
```
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