Github user dilipbiswal commented on a diff in the pull request: https://github.com/apache/spark/pull/17330#discussion_r106795788 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/CachedTableSuite.scala --- @@ -655,6 +663,148 @@ class CachedTableSuite extends QueryTest with SQLTestUtils with SharedSQLContext } } + test("SPARK-19993 subquery caching") { + withTempView("t1", "t2") { + Seq(1).toDF("c1").createOrReplaceTempView("t1") + Seq(1).toDF("c1").createOrReplaceTempView("t2") + + val ds1 = + sql( + """ + |SELECT * FROM t1 + |WHERE + |NOT EXISTS (SELECT * FROM t1) + """.stripMargin) + assert(getNumInMemoryRelations(ds1) == 0) + + ds1.cache() + + val cachedDs = + sql( + """ + |SELECT * FROM t1 + |WHERE + |NOT EXISTS (SELECT * FROM t1) + """.stripMargin) + assert(getNumInMemoryRelations(cachedDs) == 1) + + // Additional predicate in the subquery plan should cause a cache miss + val cachedMissDs = + sql( + """ + |SELECT * FROM t1 + |WHERE + |NOT EXISTS (SELECT * FROM t1 where c1 = 0) + """.stripMargin) + assert(getNumInMemoryRelations(cachedMissDs) == 0) + + // Simple correlated predicate in subquery + val ds2 = + sql( + """ + |SELECT * FROM t1 + |WHERE + |t1.c1 in (SELECT t2.c1 FROM t2 where t1.c1 = t2.c1) + """.stripMargin) + assert(getNumInMemoryRelations(ds2) == 0) + + ds2.cache() + + val cachedDs2 = + sql( + """ + |SELECT * FROM t1 + |WHERE + |t1.c1 in (SELECT t2.c1 FROM t2 where t1.c1 = t2.c1) + """.stripMargin) + + assert(getNumInMemoryRelations(cachedDs2) == 1) + + spark.catalog.cacheTable("t1") + ds1.unpersist() --- End diff -- @gatorsmile Sure. will do.
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