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https://issues.apache.org/jira/browse/SPARK-1669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-1669.
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Resolution: Fixed
Fix Version/s: 1.1.0
1.0.1
https://github.com/apache/spark/pull/1183
> SQLContext.cacheTable() should be idempotent
> --------------------------------------------
>
> Key: SPARK-1669
> URL: https://issues.apache.org/jira/browse/SPARK-1669
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.0.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
> Labels: cache, column
> Fix For: 1.0.1, 1.1.0
>
>
> Calling {{cacheTable()}} on some table {{t}} multiple times causes table
> {{t}} to be cached multiple times. This semantics is different from
> {{RDD.cache()}}, which is idempotent.
> We can check whether a table is already cached by checking:
> # whether the structure of the underlying logical plan of the table is
> matches the pattern {{Subquery(\_, SparkLogicalPlan(inMem @
> InMemoryColumnarTableScan(_, _)))}}
> # whether {{inMem.cachedColumnBuffers.getStorageLevel.useMemory}} is true
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