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https://issues.apache.org/jira/browse/SPARK-21484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liang-Chi Hsieh updated SPARK-21484:
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Summary: Wrong query plans of Dataset after persist/unpersist (was: Wrong
query plans of Dataset after persist/unperesist)
> Wrong query plans of Dataset after persist/unpersist
> ----------------------------------------------------
>
> Key: SPARK-21484
> URL: https://issues.apache.org/jira/browse/SPARK-21484
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Liang-Chi Hsieh
>
> After the cal of persist/unpersis, the query plans of a Dataset should be
> changed accordingly. But currently the query plans are the same. So you will
> see the inconsistent query plans like:
> {code}
> scala> val x1 = Seq(1).toDF()
> x1: org.apache.spark.sql.DataFrame = [value: int]
> scala> println(x1.queryExecution.executedPlan) // query plans are
> materialized before persist()
> LocalTableScan [value#1]
> println(x1.queryExecution.executedPlan)
> scala> x1.persist()
> scala> x1.count()
> scala> println(x1.queryExecution.executedPlan)
> LocalTableScan [value#1]
> {code}
> {code}
> scala> val x1 = Seq(1).toDF()
> x1: org.apache.spark.sql.DataFrame = [value: int]
> scala> x1.persist()
> scala> x1.count()
> scala> println(x1.queryExecution.executedPlan) // query plans are
> materialized after persist()
> InMemoryTableScan [value#24]
> +- InMemoryRelation [value#24], true, 10000, StorageLevel(disk, memory,
> deserialized, 1 replicas)
> +- LocalTableScan [value#1]
> scala> x1.unpersist()
> scala> println(x1.queryExecution.executedPlan)
> InMemoryTableScan [value#24]
> +- InMemoryRelation [value#24], true, 10000, StorageLevel(disk, memory,
> deserialized, 1 replicas)
> +- LocalTableScan [value#1]
> {code}
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