jeff303 commented on issue #17293: [SPARK-19950][SQL] Fix to ignore nullable when df.load() is executed for file-based data source URL: https://github.com/apache/spark/pull/17293#issuecomment-482405359 Thanks for the answer, @HyukjinKwon. Is there any place that specifies the full syntax (DDL and/or JSON) and known limitations of custom schemas? I searched in various ways through the docs root [here](https://spark.apache.org/docs/) but couldn't find anything. We are incorporating support for custom schemas into our tool and I was hoping to find something I could link our users to.
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