diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
index 7c31a0091811..4aa7bf1c4f9a 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
@@ -41,7 +41,8 @@ abstract class LogicalPlan
   def metadataOutput: Seq[Attribute] = children.flatMap(_.metadataOutput)
 
   /** Returns true if this subtree has data from a streaming data source. */
-  def isStreaming: Boolean = children.exists(_.isStreaming)
+  def isStreaming: Boolean = _isStreaming
+  private[this] lazy val _isStreaming = children.exists(_.isStreaming)
 
   override def verboseStringWithSuffix(maxFields: Int): String = {
     super.verboseString(maxFields) + statsCache.map(", " + _.toString).getOrElse("")