viirya commented on a change in pull request #24344: [SPARK-27440][SQL]
Optimize uncorrelated predicate subquery
URL: https://github.com/apache/spark/pull/24344#discussion_r276586145
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
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@@ -299,7 +314,7 @@ case class ListQuery(
childOutputs.head.dataType
}
override lazy val resolved: Boolean = childrenResolved && plan.resolved &&
childOutputs.nonEmpty
- override def nullable: Boolean = false
+ override def nullable: Boolean = plan.schema.fields.exists(_.nullable)
Review comment:
Is an existing issue or related to this change?
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