Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/10452#issuecomment-169411013
Okay, we can back port it. I'm a little curious about your use case, as
this seems mostly cosmetic to me. If users can run Spark jobs they have access
to the JVM that will allow them to steal these credentials in ways that are not
running EXPLAIN. If these are metastore tables and they are using the JDBC
server they similarly have the power to query them from the metastore.
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