rdblue opened a new pull request #24937: [SPARK-28139][SQL] Add v2 ALTER TABLE implementation. URL: https://github.com/apache/spark/pull/24937 ## What changes were proposed in this pull request? * Implement `ALTER TABLE` for v2 tables * Add `AlterTable` logical plan and `AlterTableExec` physical plan * Convert `ALTER TABLE` parsed plans to `AlterTable` when a v2 catalog is responsible for an identifier * Validate that columns to alter exist in analyzer checks * Fix nested type handling in `CatalogV2Util` ## How was this patch tested? * Add extensive tests in `DataSourceV2SQLSuite`
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