Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19901#discussion_r155404402
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -237,37 +237,44 @@ case class In(value: Expression, list:
Seq[Expression]) extends Predicate {
val javaDataType = ctx.javaType(value.dataType)
val valueGen = value.genCode(ctx)
val listGen = list.map(_.genCode(ctx))
- ctx.addMutableState(ctx.JAVA_BOOLEAN, ev.value)
- ctx.addMutableState(ctx.JAVA_BOOLEAN, ev.isNull)
+ // inTmpResult has 3 possible values:
+ // -1 means no matches found and there is at least one value in the
list evaluated
--- End diff --
`... evaluated to null`
---
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