Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21045#discussion_r202686626
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -128,6 +128,172 @@ case class MapKeys(child: Expression)
override def prettyName: String = "map_keys"
}
+@ExpressionDescription(
+ usage = """
+ _FUNC_(a1, a2, ...) - Returns a merged array of structs in which the
N-th struct contains all
+ N-th values of input arrays.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3), array(2, 3, 4));
+ [[1, 2], [2, 3], [3, 4]]
+ > SELECT _FUNC_(array(1, 2), array(2, 3), array(3, 4));
+ [[1, 2, 3], [2, 3, 4]]
+ """,
+ since = "2.4.0")
+case class ArraysZip(children: Seq[Expression]) extends Expression with
ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] =
Seq.fill(children.length)(ArrayType)
+
+ override def dataType: DataType = ArrayType(mountSchema)
--- End diff --
I understand that fields of the nested ```struct``` can be ```null```, but
can you give me an example of the input that would lead to something like
```Seq(null, Seq(9002, 1L))```?
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