Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13971#discussion_r69054154
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
---
@@ -115,9 +112,26 @@ case class Explode(child: Expression) extends
UnaryExpression with Generator wit
// hive-compatible default alias for explode function ("col" for array,
"key", "value" for map)
override def elementSchema: StructType = child.dataType match {
- case ArrayType(et, containsNull) => new StructType().add("col", et,
containsNull)
+ case ArrayType(et, containsNull) =>
+ if (position) {
--- End diff --
instead of using if here, I'd like to implement `elementSchema` in
`Explode` and `PosExplode `
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