Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21018#discussion_r180717823
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala ---
@@ -119,26 +119,60 @@ class CacheManager extends Logging {
while (it.hasNext) {
val cd = it.next()
if (cd.plan.find(_.sameResult(plan)).isDefined) {
- cd.cachedRepresentation.cachedColumnBuffers.unpersist(blocking)
+ cd.cachedRepresentation.clearCache(blocking)
it.remove()
}
}
}
+ /**
+ * Materialize the cache that refers to the given physical plan.
--- End diff --
why do we do this?
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