Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19309
Let me summarize the PR. Please correct me if anything is missing.
**Background**
Currently, our users can register a listener one by one during the
executions by calling the SparkContext API:
> def addSparkListener(listener: SparkListenerInterface)
Users also can specify them through the Conf `spark.extraListeners`.
SparkContext will automatically register the extra listeners during the
initialization phase.
In Spark SQL, QueryExecutionListener enable users to register
QueryExecutionListener by calling the API
> def register(listener: QueryExecutionListener)
**Proposal**
This PR is proposing to add a similar static SQLConf
`spark.sql.queryExecutionListeners`. When a Spark session is built/cloned, the
query execution listeners specified in the new conf will be registered
automatically.
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