cloud-fan commented on a change in pull request #30296:
URL: https://github.com/apache/spark/pull/30296#discussion_r519785383
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
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@@ -1966,7 +1966,20 @@ case class ElementAt(left: Expression, right: Expression)
}
override def nullable: Boolean = left.dataType match {
- case _: ArrayType => computeNullabilityFromArray(left, right)
+ case _: ArrayType =>
+ def specialNormalizeIndex: (Int, Int) => Int = {
+ (arrayLength: Int, index: Int) => {
+ if (index < 0) {
+ arrayLength + index
+ } else if (index == 0) {
Review comment:
why not
```
if (index <= 0) {
arrayLength + index
} ...
```
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