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https://issues.apache.org/jira/browse/SPARK-24488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-24488:
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Assignee: Apache Spark
> Analyzer throws when generator is aliased multiple times
> --------------------------------------------------------
>
> Key: SPARK-24488
> URL: https://issues.apache.org/jira/browse/SPARK-24488
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Brandon Krieger
> Assignee: Apache Spark
> Priority: Minor
>
> Currently, the Analyzer throws an exception if your try to nest a generator.
> However, it special cases generators "nested" in an alias, and allows that.
> If you try to alias a generator twice, it is not caught by the special case,
> so an exception is thrown:
>
> {code:java}
> scala> Seq(("a", "b"))
> .toDF("col1","col2")
> .select(functions.array('col1,'col2).as("arr"))
> .select(functions.explode('arr).as("first").as("second"))
> .collect()
> org.apache.spark.sql.AnalysisException: Generators are not supported when
> it's nested in expressions, but got: explode(arr) AS `first`;
> at
> org.apache.spark.sql.catalyst.analysis.Analyzer$ExtractGenerator$$anonfun$apply$23.applyOrElse(Analyzer.scala:1604)
> at
> org.apache.spark.sql.catalyst.analysis.Analyzer$ExtractGenerator$$anonfun$apply$23.applyOrElse(Analyzer.scala:1601)
> {code}
>
> In reality, aliasing twice is fine, so we can fix this by trimming non
> top-level aliases.
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