Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/14639
It's all of the Runtime Config from the current active SparkSession which
includes all SparkConf.
http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.sql.SparkSession
```
Runtime configuration interface for Spark.
This is the interface through which the user can get and set all Spark and
Hadoop configurations that are relevant to Spark SQL. When getting the value of
a config, this defaults to the value set in the underlying SparkContext, if any.
```
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