ulysses-you opened a new pull request #25198: [SPARK-28443][SQL] Spark sql add exception when create field type NullType URL: https://github.com/apache/spark/pull/25198 ## What changes were proposed in this pull request? More detail see [PR](https://github.com/apache/spark/pull/25085). This PR is to discuss details that `add exception when create field type NullType` ## How was this patch tested? UT
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