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-526192850 it's only in master, and is only applicable to the data source v2 catalog. You can try ``` SET spark.sql.catalog.cat1 = com.my.TheImplClass CREATE TABLE cat1.t ... ALTER TABLE cat1.t CHANGE COLUMN ... ``` `TheImplClass` should implement `TableCatalog`. We will migrate the builtin hive catalog to use the new API in the future, so that we can remove `AlterTableChangeColumnCommand`. See the tests in `DataSourceV2SQLSuite`
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