Github user yhuai commented on the pull request: https://github.com/apache/spark/pull/999#issuecomment-45814468 http://yhuai.github.io/spark-sql-core/api/#org.apache.spark.sql.json.JsonTable goes through how a user should use JsonTable. Right now, a user can optionally sample the dataset for the process of schema inferring. It is possible that the schema based on the sampled dataset has missing fields and wrong data types. In this case, after the execution of first user query, the user should call adjustSchema to see if the schema has been updated. After the first execution, the JsonTable should have the complete schema. Also, it will be good that we can provide facilities to let users refine the inferred schema.
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