cloud-fan commented on issue #23325: [SPARK-26376][SQL] Skip inputs without tokens by JSON datasource URL: https://github.com/apache/spark/pull/23325#issuecomment-450539611 if it's only for troubleshooting, I guess users can do `if(IsNull(FromJson(col)), col, FromJson(col))`. My major concern is, `PERMISSIVE` mode doesn't work well in `from_json`, because we can return map/array. Maybe another choice is, if `from_jsom` returns array/map, we should forbid `PERMISSIVE` mode.
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