Github user rxin commented on the issue: https://github.com/apache/spark/pull/19973 The issue is in ``` /** * Return the `string` value of Spark SQL configuration property for the given key. If the key is * not set yet, return `defaultValue`. */ def getConfString(key: String, defaultValue: String): String = { if (defaultValue != null && defaultValue != "<undefined>") { val entry = sqlConfEntries.get(key) if (entry != null) { // Only verify configs in the SQLConf object entry.valueConverter(defaultValue) } } Option(settings.get(key)).getOrElse(defaultValue) } ``` The value converter gets applied on this generated string which is not a real value and will fail.
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