Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/12009#discussion_r57679169
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
---
@@ -318,6 +320,138 @@ case class DescribeCommand(
}
/**
+ * A command for users to create a new database.
+ *
+ * It will issue an error message when the database with the same name
already exists,
+ * unless 'ifNotExists' is true.
+ * The syntax of using this command in SQL is:
+ * {{{
+ * CREATE DATABASE|SCHEMA [IF NOT EXISTS] database_name
+ * }}}
+ */
+case class CreateDatabase(
+ databaseName: String,
+ ifNotExists: Boolean,
+ path: Option[String],
+ comment: Option[String],
+ props: Map[String, String])
+ extends RunnableCommand {
+
+ override def run(sqlContext: SQLContext): Seq[Row] = {
+ val catalog = sqlContext.sessionState.catalog
+ catalog.createDatabase(
+ CatalogDatabase(
+ databaseName,
+ comment.getOrElse(""),
+ path.getOrElse(catalog.getDefaultDBPath(databaseName)),
+ props),
+ ifNotExists)
+ Seq.empty[Row]
+ }
+
+ override val output: Seq[Attribute] = Seq.empty
+}
+
+/**
+ * A command for users to remove a database from the system.
+ *
+ * 'ignoreIfNotExists':
+ * - true, if database_name does't exist, no action
+ * - false (default), if database_name does't exist, a warning message
will be issued
+ * 'cascade':
+ * - true, the dependent objects are automatically dropped before dropping
database.
+ * - false (default), it is in the Restrict mode. The database cannot be
dropped if
+ * it is not empty. The inclusive tables must be dropped at first.
+ *
+ * The syntax of using this command in SQL is:
+ * {{{
+ * DROP DATABASE [IF EXISTS] database_name [RESTRICT|CASCADE];
+ * }}}
+ */
+case class DropDatabase(
+ databaseName: String,
+ ignoreIfNotExists: Boolean,
--- End diff --
Sure, will do. Thanks!
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