Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/19861
With `SessionConfigSupport`, you can use the datasource session configs
more easily for that:
1. All configs with the name prefix `spark.datasource.$keyPrefix` will be
imported in to the data source options, so you can directly access them from
data source options;
2. You can use the striped name for the options, this may save some effort,
e.g. type `foo.bar` instead of `spark.datasource.$keyPrefix.foo.bar`.
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