Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21747#discussion_r201686185
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -32,7 +32,12 @@ import org.apache.spark.sql.types._
""")
// scalastyle:on line.size.limit
case class If(predicate: Expression, trueValue: Expression, falseValue:
Expression)
- extends Expression {
+ extends ComplexTypeMergingExpression {
+
+ @transient
+ override lazy val inputTypesForMerging: Seq[DataType] = {
--- End diff --
super nit: @transient lazy val
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