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https://issues.apache.org/jira/browse/SPARK-27947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
John Zhuge updated SPARK-27947:
-------------------------------
Description:
In ParsedStatement.productIterator, `case mapArg: Map[_, _]` may match any Map
type, thus causing `asInstanceOf[Map[String, String]]` to throw
ClassCastException.
The following test reproduces the issue:
{code:java}
case class TestStatement(p: Map[String, Int]) extends ParsedStatement {
override def output: Seq[Attribute] = Nil
override def children: Seq[LogicalPlan] = Nil
}
TestStatement(Map("abc" -> 1)).toString{code}
Changing the code to `case mapArg: Map[String, String]` will not work due to
type erasure. As a matter of fact, compiler gives the warning:
{noformat}
Warning:(41, 18) non-variable type argument String in type pattern
scala.collection.immutable.Map[String,String] (the underlying of
Map[String,String]) is unchecked since it is eliminated by erasure
case mapArg: Map[String, String] =>{noformat}
was:
In ParsedStatement.productIterator, `case mapArg: Map[_, _]` may match any Map
type, thus causing `asInstanceOf[Map[String, String]]` to throw
ClassCastException.
The following test reproduces the issue:
{code:java}
case class TestStatement(p: Map[String, Int]) extends ParsedStatement {
override def output: Seq[Attribute] = Nil
override def children: Seq[LogicalPlan] = Nil
}
TestStatement(Map("abc" -> 1)).toString{code}
Changing the code to `case mapArg: Map[String, String]` will not work due to
type erasure. As a matter of fact, compiler gives the warning:
{noformat}
Warning:(41, 18) non-variable type argument String in type pattern
scala.collection.immutable.Map[String,String] (the underlying of
Map[String,String]) is unchecked since it is eliminated by erasure
case mapArg: Map[String, String] =>{noformat}
> ParsedStatement subclass toString may throw ClassCastException
> --------------------------------------------------------------
>
> Key: SPARK-27947
> URL: https://issues.apache.org/jira/browse/SPARK-27947
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: John Zhuge
> Priority: Minor
>
> In ParsedStatement.productIterator, `case mapArg: Map[_, _]` may match any
> Map type, thus causing `asInstanceOf[Map[String, String]]` to throw
> ClassCastException.
> The following test reproduces the issue:
> {code:java}
> case class TestStatement(p: Map[String, Int]) extends ParsedStatement {
> override def output: Seq[Attribute] = Nil
> override def children: Seq[LogicalPlan] = Nil
> }
> TestStatement(Map("abc" -> 1)).toString{code}
> Changing the code to `case mapArg: Map[String, String]` will not work due to
> type erasure. As a matter of fact, compiler gives the warning:
> {noformat}
> Warning:(41, 18) non-variable type argument String in type pattern
> scala.collection.immutable.Map[String,String] (the underlying of
> Map[String,String]) is unchecked since it is eliminated by erasure
> case mapArg: Map[String, String] =>{noformat}
>
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