Brandon Krieger created SPARK-24488:
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Summary: 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
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 `qqq`;
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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