[jira] [Created] (SPARK-20872) ShuffleExchange.nodeName should handle null coordinator

["Kris Mok (JIRA)" <ji...@apache.org>]

Kris Mok created SPARK-20872:
--------------------------------

             Summary: ShuffleExchange.nodeName should handle null coordinator
                 Key: SPARK-20872
                 URL: https://issues.apache.org/jira/browse/SPARK-20872
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Kris Mok
            Priority: Trivial


A ShuffleExchange's coordinator can be null sometimes, and when we need to do a toString() on it, it'll go to ShuffleExchange.nodeName() and throw a MatchError there because of inexhaustive match -- the match only handles Some and None, but doesn't handle null.

An example of this issue is when trying to inspect a Catalyst physical operator in an IDE:
{code:none}
child = {WholeStageCodegenExec@13881} Method threw 'scala.MatchError' exception. Cannot evaluate org.apache.spark.sql.execution.WholeStageCodegenExec.toString()
{code}
where this WholeStageCodegenExec transitively references a ShuffleExchange.



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