Github user CodingCat commented on a diff in the pull request:
https://github.com/apache/spark/pull/19864#discussion_r155140125
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala ---
@@ -94,14 +94,16 @@ class CacheManager extends Logging {
logWarning("Asked to cache already cached data.")
} else {
val sparkSession = query.sparkSession
- cachedData.add(CachedData(
- planToCache,
- InMemoryRelation(
- sparkSession.sessionState.conf.useCompression,
- sparkSession.sessionState.conf.columnBatchSize,
- storageLevel,
- sparkSession.sessionState.executePlan(planToCache).executedPlan,
- tableName)))
+ val inMemoryRelation = InMemoryRelation(
+ sparkSession.sessionState.conf.useCompression,
+ sparkSession.sessionState.conf.columnBatchSize,
+ storageLevel,
+ sparkSession.sessionState.executePlan(planToCache).executedPlan,
+ tableName)
+ if (planToCache.conf.cboEnabled &&
planToCache.stats.rowCount.isDefined) {
--- End diff --
no, if CBO is disabled, the relation's sizeInBytes is the file size
https://github.com/apache/spark/blob/5c3a1f3fad695317c2fff1243cdb9b3ceb25c317/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/HadoopFsRelation.scala#L85
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