Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16529#discussion_r95449936
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -81,44 +81,36 @@ abstract class LogicalPlan extends
QueryPlan[LogicalPlan] with Logging {
}
}
+ /** A cache for the estimated statistics, such that it will only be
computed once. */
+ private val statsCache = new ThreadLocal[Option[Statistics]] {
--- End diff --
why does this need to be thread local?
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