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https://issues.apache.org/jira/browse/SPARK-12536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-12536:
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Assignee: Apache Spark
> Fix the Explain Outputs of Empty LocalRelation and LocalTableScan
> -----------------------------------------------------------------
>
> Key: SPARK-12536
> URL: https://issues.apache.org/jira/browse/SPARK-12536
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Xiao Li
> Assignee: Apache Spark
>
> The filter Filter (False) generates an empty LocalRelation in
> SimplifyFilters. In the current Explain, the optimized and physical plans
> look confusing.
> For example,
> {code}
> val df = Seq(1 -> "a").toDF("a", "b")
> df.where("1 = 0").explain(true)
> {code}
> {code}
> == Parsed Logical Plan ==
> Filter (1 = 0)
> +- Project [_1#0 AS a#2,_2#1 AS b#3]
> +- LocalRelation [_1#0,_2#1], [[1,a]]
> == Analyzed Logical Plan ==
> a: int, b: string
> Filter (1 = 0)
> +- Project [_1#0 AS a#2,_2#1 AS b#3]
> +- LocalRelation [_1#0,_2#1], [[1,a]]
> == Optimized Logical Plan ==
> LocalRelation [a#2,b#3]
> == Physical Plan ==
> LocalTableScan [a#2,b#3]
> {code}
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