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new 87a60559634f [SPARK-58863][ML] Make tree leaf attribute uncached
87a60559634f is described below
commit 87a60559634f64a78e1ec3e46faa9468577be1a8
Author: Ruifeng Zheng <[email protected]>
AuthorDate: Thu Aug 20 09:01:32 2026 +0800
[SPARK-58863][ML] Make tree leaf attribute uncached
### What changes were proposed in this pull request?
Change tree model `leafAttr` from a `lazy val` to a `def`.
`leafAttr` is a small metadata object derived from `numLeave`, and
`numLeave` remains cached.
### Why are the changes needed?
`leafAttr` is only used when building leaf-column schema metadata. Since
the expensive leaf count
is already cached by `numLeave`, caching the derived attribute itself is
unnecessary.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Ran:
```
build/sbt -java-home /usr/lib/jvm/java-17-openjdk-amd64 mllib/compile
```
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Codex (GPT-5)
Closes #58109 from zhengruifeng/ml-leafattr-def.
Authored-by: Ruifeng Zheng <[email protected]>
Signed-off-by: Ruifeng Zheng <[email protected]>
---
mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala
b/mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala
index 4e9fa89cbde9..fdc4110573ba 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tree/treeModels.scala
@@ -98,7 +98,7 @@ private[spark] trait DecisionTreeModel {
private[ml] lazy val numLeave: Int =
leafIterator(rootNode).size
- private[ml] lazy val leafAttr = {
+ private[ml] def leafAttr = {
NominalAttribute.defaultAttr
.withNumValues(numLeave)
}
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