Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19864#discussion_r156550114
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala ---
@@ -80,6 +80,14 @@ class CacheManager extends Logging {
cachedData.isEmpty
}
+ private def extractStatsOfPlanForCache(plan: LogicalPlan):
Option[Statistics] = {
+ if (plan.stats.rowCount.isDefined) {
--- End diff --
why this condition? Even there is no row count, the `sizeInBytes` is still
better than `defaultSizeInBytes`
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