beliefer commented on pull request #29999:
URL: https://github.com/apache/spark/pull/29999#issuecomment-707458123
@maropu If there have a lot of like, the reduceLeft will construct very deep
tree. This will lead to unlimited function calls to increase the height of the
thread stack.
```
at org.apache.spark.sql.catalyst.trees.TreeNode.foreach(TreeNode.scala:175)
at
org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$foreach$1(TreeNode.scala:175)
at
org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$foreach$1$adapted(TreeNode.scala:175)
at scala.collection.immutable.List.foreach(List.scala:392)
at org.apache.spark.sql.catalyst.trees.TreeNode.foreach(TreeNode.scala:175)
at
org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$foreach$1(TreeNode.scala:175)
at
org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$foreach$1$adapted(TreeNode.scala:175)
at scala.collection.immutable.List.foreach(List.scala:392)
at org.apache.spark.sql.catalyst.trees.TreeNode.foreach(TreeNode.scala:175)
at
org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$foreach$1(TreeNode.scala:175)
at
org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$foreach$1$adapted(TreeNode.scala:175)
at scala.collection.immutable.List.foreach(List.scala:392)
......
```
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