[jira] [Created] (SPARK-27947) ParsedStatement subclass toString may throw ClassCastException

["John Zhuge (JIRA)" <ji...@apache.org>]

John Zhuge created SPARK-27947:
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             Summary: 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


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}
{code:java}
 {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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