Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/19729#discussion_r150419122
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
---
@@ -670,6 +673,8 @@ case class Greatest(children: Seq[Expression]) extends
Expression {
val evalChildren = children.map(_.genCode(ctx))
val first = evalChildren(0)
--- End diff --
ditto
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