Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/19729#discussion_r150473862
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
---
@@ -604,6 +604,8 @@ case class Least(children: Seq[Expression]) extends
Expression {
val evalChildren = children.map(_.genCode(ctx))
val first = evalChildren(0)
--- End diff --
the `value` is used only when `isNull` is `false`. And in that context a
proper value has been set for `value`, thus the problem you are describing
can't happen IMHO.
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