Github user LantaoJin commented on the issue:
https://github.com/apache/spark/pull/22353
The purpose is logging meta info like file input file path to event log. So
I revert the changes about simpleString and add back the metadata to
SparkPlanInfo interface. This change will log metadata into event log in
SparkListenerSQLExecutionStart and it is still benefited in #18600 .
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