cloud-fan commented on issue #21012: [SPARK-23890][SQL] Support CHANGE COLUMN to add nested fields to structs URL: https://github.com/apache/spark/pull/21012#issuecomment-526176281 AFAIK we already support changing nested fields with command `AlterTable`. `AlterTableChangeColumnCommand` is outdated and will be removed in the future. cc @rdblue
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