Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22544#discussion_r220533930
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -2140,21 +2140,34 @@ case class ElementAt(left: Expression, right:
Expression) extends GetMapValueUti
}
override def inputTypes: Seq[AbstractDataType] = {
- Seq(TypeCollection(ArrayType, MapType),
- left.dataType match {
- case _: ArrayType => IntegerType
- case _: MapType => mapKeyType
- case _ => AnyDataType // no match for a wrong 'left' expression
type
- }
- )
+ (left.dataType, right.dataType) match {
+ case (ArrayType(e1, hasNull), e2: IntegralType) if (e2 != LongType)
=>
--- End diff --
nit:
```
case (arr: ArrayType, e2: IntegralType) if ... =>
Seq(arr, IntegerType)
```
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