Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/12600#discussion_r60779639
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala ---
@@ -187,11 +187,11 @@ abstract class SparkPlan extends QueryPlan[SparkPlan]
with Logging with Serializ
/**
* Prepare a SparkPlan for execution. It's idempotent.
*/
- final def prepare(): Unit = {
+ final def prepare(): Unit = synchronized {
--- End diff --
Could you add comments for `doPrepare` to mention the lock?
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