HyukjinKwon commented on issue #27110: [SPARK-30439][SQL] Support non-nullable column in CREATE TABLE, ADD COLUMN and ALTER TABLE URL: https://github.com/apache/spark/pull/27110#issuecomment-572370564 Will you update the docs (e.g., `sql-ref-syntax-ddl-alter-table.md`) to document this syntax separately? > because the table schema in hive catalog are always nullable Arguably, this is more used often rather than catalog plugin at this moment. Maybe it's best to document it together in the doc.
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