Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10734#discussion_r49548447
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -81,44 +81,38 @@ case class If(predicate: Expression, trueValue:
Expression, falseValue: Expressi
/**
* Case statements of the form "CASE WHEN a THEN b [WHEN c THEN d]* [ELSE
e] END".
* When a = true, returns b; when c = true, returns d; else returns e.
+ *
+ * The last value is (optionally) the else value.
*/
-case class CaseWhen(branches: Seq[Expression]) extends Expression {
-
- // Use private[this] Array to speed up evaluation.
- @transient private[this] lazy val branchesArr = branches.toArray
-
- override def children: Seq[Expression] = branches
+case class CaseWhen(conditions: Seq[Expression], values: Seq[Expression])
extends Expression {
--- End diff --
it is easier to review this by looking at the file rather than the diff.
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