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#### What changes were proposed in this pull request? This PR is to implement the following four Database-related DDL commands: - `CREATE DATABASE|SCHEMA [IF NOT EXISTS] database_name` - `DROP DATABASE [IF EXISTS] database_name [RESTRICT|CASCADE]` - `DESCRIBE DATABASE [EXTENDED] db_name` - `ALTER (DATABASE|SCHEMA) database_name SET DBPROPERTIES (property_name=property_value, ...)` Another PR will be submitted to handle the unsupported commands. In the Database-related DDL commands, we will issue an error exception for `ALTER (DATABASE|SCHEMA) database_name SET OWNER [USER|ROLE] user_or_role`. cc yhuai andrewor14 rxin Could you review the changes? Is it in the right direction? Thanks! #### How was this patch tested? Added a few test cases in `command/DDLSuite.scala` for testing DDL command execution in `SQLContext`. Since `HiveContext` also shares the same implementation, the existing test cases in `\hive` also verifies the correctness of these commands. Author: gatorsmile <gatorsmile@gmail.com> Author: xiaoli <lixiao1983@gmail.com> Author: Xiao Li <xiaoli@Xiaos-MacBook-Pro.local> Closes #12009 from gatorsmile/dbDDL. |
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