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[SPARK-19558][sql] Add config key to register QueryExecutionListeners automatically. #19309
This change adds a new SQL config key that is equivalent to SparkContext's
The code used by SparkContext to implement the feature was refactored into
Unit tests were added to verify all the new functionality.
Let me summarize the PR. Please correct me if anything is missing.
Currently, our users can register a listener one by one during the executions by calling the SparkContext API:
Users also can specify them through the Conf
In Spark SQL, QueryExecutionListener enables users to register QueryExecutionListener by calling the API
This PR is proposing to add a similar static SQLConf