dongjoon-hyun commented on a change in pull request #27185: [SPARK-30494][SQL]
Fix the leak of cached data when replace an existing temp view
URL: https://github.com/apache/spark/pull/27185#discussion_r396217365
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File path: sql/core/src/test/scala/org/apache/spark/sql/CachedTableSuite.scala
##########
@@ -1122,4 +1122,47 @@ class CachedTableSuite extends QueryTest with
SQLTestUtils
assert(!spark.catalog.isCached("t1"))
}
}
+
+ test("SPARK-30494 avoid duplicated cached RDD when replace an existing
view") {
+ withTempView("tempView") {
+ spark.catalog.clearCache()
+ sql("create or replace temporary view tempView as select 1")
+ sql("cache table tempView")
+ assert(spark.sharedState.cacheManager.lookupCachedData(sql("select
1")).isDefined)
+ sql("create or replace temporary view tempView as select 1, 2")
+ assert(spark.sharedState.cacheManager.lookupCachedData(sql("select
1")).isEmpty)
+ sql("cache table tempView")
+ assert(spark.sharedState.cacheManager.lookupCachedData(sql("select 1,
2")).isDefined)
+ assert(spark.sharedState.cacheManager.lookupCachedData(sql("select
1")).isEmpty)
+ }
+
+ withGlobalTempView("tempGlobalTempView") {
+ spark.catalog.clearCache()
+ sql("create or replace global temporary view tempGlobalTempView as
select 1")
+ sql("cache table global_temp.tempGlobalTempView")
+ assert(spark.sharedState.cacheManager.lookupCachedData(sql("select
1")).isDefined)
+ sql("create or replace global temporary view tempGlobalTempView as
select 1, 2")
+ assert(spark.sharedState.cacheManager.lookupCachedData(sql("select
1")).isEmpty)
+ sql("cache table global_temp.tempGlobalTempView")
+ assert(spark.sharedState.cacheManager.lookupCachedData(sql("select 1,
2")).isDefined)
+ assert(spark.sharedState.cacheManager.lookupCachedData(sql("select
1")).isEmpty)
+ }
+
+ withView("view1") {
+ spark.catalog.clearCache()
+ sql("create or replace view view1 as select 1")
+ sql("cache table view1")
+ sql("create or replace view view1 as select 1, 2")
+ sql("cache table view1")
+ // the cached plan of persisted view likes below,
+ // so we cannot use the same assertion of temp view.
+ // SubqueryAlias
+ // |
+ // + View
+ // |
+ // + Project[1 AS 1]
+ spark.sharedState.cacheManager.uncacheQuery(spark.table("view1"),
cascade = false)
+ assert(spark.sharedState.cacheManager.isEmpty)
Review comment:
Then, please remove this misleading test case between line 1149 and 1165.
> no cached data leak for persisted view
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