leanken commented on a change in pull request #30296:
URL: https://github.com/apache/spark/pull/30296#discussion_r519669993
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
##########
@@ -1966,7 +1966,7 @@ case class ElementAt(left: Expression, right: Expression)
}
override def nullable: Boolean = left.dataType match {
- case _: ArrayType => computeNullabilityFromArray(left, right)
+ case _: ArrayType => computeNullabilityFromArray(left, right,
isOneBasedIndex = true)
Review comment:
```
_FUNC_(array, index) - Returns element of array at given (1-based) index. If
index < 0,
accesses elements from the last to the first. Returns NULL if the
index exceeds the length
of the array.
```
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