stczwd commented on issue #20884: [SPARK-23773][SQL] JacksonGenerator does not include keys that have null value for StructTypes URL: https://github.com/apache/spark/pull/20884#issuecomment-541265439 Can we reopen this issue or let me open a new one? toJSON is used in sparkmagic, which is widely used in jupyter, to get sql return results. with toJSON sparkmagic may return empty results. Maybe adding a config is the best choice.
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