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[SPARK-8077][SQL] Optimization for TreeNodes with large numbers of children #6673

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[SPARK-8077][SQL] Optimization for TreeNodes with large numbers of children #6673

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SPARK-8077: Optimization for TreeNodes with large numbers of children
MickDavies Jun 5, 2015
d80103b
SPARK-8077: Optimization for TreeNodes with large numbers of children
MickDavies Jun 12, 2015
38cd425
SPARK-8077: Optimization for TreeNodes with large numbers of children
MickDavies Jun 12, 2015
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SPARK-8077: Optimization for TreeNodes with large numbers of children 
Add comment about required immutability of children
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@MickDavies
MickDavies committed Jun 12, 2015
commit 38cd42549ea39188216d43998230efa474bf546b
5 changes: 4 additions & 1 deletion sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
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Expand Up @@ -59,7 +59,10 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] {

val origin: Origin = CurrentOrigin.get

/** Returns a Seq of the children of this node */
/**
* Returns a Seq of the children of this node.
* Children should not change. Immutability required for containsChild optimization
*/
def children: Seq[BaseType]

lazy val containsChild: Set[TreeNode[_]] = children.toSet
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