Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/12009#discussion_r58006853
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
@@ -45,46 +45,135 @@ abstract class NativeDDLCommand(val sql: String)
extends RunnableCommand {
}
+/**
+ * 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])(sql: String)
- extends NativeDDLCommand(sql) with Logging
+ 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]
+ }
--- End diff --
I tried it in `spark-sql`. If the directory is not created, Hive will do it
for us. I am wondering if we still should create directory in Spark?
However, this PR has an issue when users specify the location in the
`Create Database` command. The generated path should be `path/databaseName.db`
instead of `path`. Will fix it soon.
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