yaooqinn commented on issue #26806: [SPARK-30183][SQL] Disallow to specify reserved properties in CREATE … URL: https://github.com/apache/spark/pull/26806#issuecomment-563212656 presto has no comment as database attribute https://prestodb.io/docs/current/sql/create-schema.html postgresql has `comment on` syntax https://www.postgresql.org/docs/9.1/sql-comment.html Mysql allows comments only for tables and columns. `ALTER TABLE t1 COMMENT = 'New table comment';` https://dev.mysql.com/doc/refman/8.0/en/alter-database.html
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