gatorsmile commented on issue #23398: [SPARK-26493][SQL] Allow multiple spark.sql.extensions URL: https://github.com/apache/spark/pull/23398#issuecomment-450406587 @RussellSpitzer See this example. ```Scala val conf = new SparkConf() val seq = ConfigBuilder(testKey("seq")).stringConf.toSequence.createWithDefault(Seq()) conf.set(seq.key, "1,,2, 3 , , 4") assert(conf.get(seq) === Seq("1", "2", "3", "4")) conf.set(seq, Seq("1", "2")) assert(conf.get(seq) === Seq("1", "2")) ```
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