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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