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https://issues.apache.org/jira/browse/SPARK-38528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17505149#comment-17505149
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Bruce Robbins commented on SPARK-38528:
---------------------------------------
This is a bug in {{ExtractGenerator}} in which an array ({{{}projectExprs{}}})
is updated from within a closure passed to a map operation (the array is
external to the closure). If the sequence of expressions on which the map
operation is called is a {{{}Stream{}}}, the map operation is evaluated lazily,
so the array is not fully updated before the rule completes.
> NullPointerException when selecting a generator in a Stream of aggregate
> expressions
> ------------------------------------------------------------------------------------
>
> Key: SPARK-38528
> URL: https://issues.apache.org/jira/browse/SPARK-38528
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.3, 3.2.1, 3.3.0
> Reporter: Bruce Robbins
> Priority: Major
>
> Assume this dataframe:
> {noformat}
> val df = Seq(1, 2, 3).toDF("v")
> {noformat}
> This works:
> {noformat}
> df.select(Seq(explode(array(min($"v"), max($"v"))), sum($"v")): _*).collect
> {noformat}
> However, this doesn't:
> {noformat}
> df.select(Stream(explode(array(min($"v"), max($"v"))), sum($"v")): _*).collect
> {noformat}
> It throws this error:
> {noformat}
> java.lang.NullPointerException
> at
> org.apache.spark.sql.catalyst.analysis.Analyzer$GlobalAggregates$.$anonfun$containsAggregates$1(Analyzer.scala:2516)
> at scala.collection.immutable.List.flatMap(List.scala:366)
> at
> org.apache.spark.sql.catalyst.analysis.Analyzer$GlobalAggregates$.containsAggregates(Analyzer.scala:2515)
> at
> org.apache.spark.sql.catalyst.analysis.Analyzer$GlobalAggregates$$anonfun$apply$31.applyOrElse(Analyzer.scala:2509)
> at
> org.apache.spark.sql.catalyst.analysis.Analyzer$GlobalAggregates$$anonfun$apply$31.applyOrElse(Analyzer.scala:2508)
> {noformat}
> The only difference between the two queries is that the first one uses
> {{Seq}} to specify the varargs, whereas the second one uses {{Stream}}.
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