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https://issues.apache.org/jira/browse/SPARK-18549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15688286#comment-15688286
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Dongjoon Hyun commented on SPARK-18549:
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`InMemoryRelation` of `CachedData` has `tableName: Option[String]`. Can we use
that?
> Failed to Uncache a View that References a Dropped Table.
> ---------------------------------------------------------
>
> Key: SPARK-18549
> URL: https://issues.apache.org/jira/browse/SPARK-18549
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.2
> Reporter: Xiao Li
> Priority: Critical
>
> {code}
> spark.range(1, 10).toDF("id1").write.format("json").saveAsTable("jt1")
> spark.range(1, 10).toDF("id2").write.format("json").saveAsTable("jt2")
> sql("CREATE VIEW testView AS SELECT * FROM jt1 JOIN jt2 ON id1 == id2")
> // Cache is empty at the beginning
> assert(spark.sharedState.cacheManager.isEmpty)
> sql("CACHE TABLE testView")
> assert(spark.catalog.isCached("testView"))
> // Cache is not empty
> assert(!spark.sharedState.cacheManager.isEmpty)
> {code}
> {code}
> // drop a table referenced by a cached view
> sql("DROP TABLE jt1")
> -- So far everything is fine
> // Failed to unache the view
> val e = intercept[AnalysisException] {
> sql("UNCACHE TABLE testView")
> }.getMessage
> assert(e.contains("Table or view not found: `default`.`jt1`"))
> // We are unable to drop it from the cache
> assert(!spark.sharedState.cacheManager.isEmpty)
> {code}
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