Github user dilipbiswal commented on a diff in the pull request: https://github.com/apache/spark/pull/11991#discussion_r57795477 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala --- @@ -350,6 +354,34 @@ case class ShowTablesCommand(databaseName: Option[String]) extends RunnableComma } /** + * A command for users to list the databases/schemas. + * If a databasePattern is supplied then the databases that only matches the + * pattern would be listed. + * The syntax of using this command in SQL is: + * {{{ + * SHOW (DATABASES|SCHEMAS) [LIKE 'identifier_with_wildcards']; + * }}} + */ +case class ShowDatabasesCommand(databasePattern: Option[String]) extends RunnableCommand { + + // The result of SHOW DATABASES has one column called 'result' + override val output: Seq[Attribute] = { + val schema = StructType( + StructField("result", StringType, false) :: Nil) + + schema.toAttributes + } + + override def run(sqlContext: SQLContext): Seq[Row] = { + val catalog = sqlContext.sessionState.catalog + val databases = + databasePattern.map(catalog.listDatabases(_)).getOrElse(catalog.listDatabases()) + val rows = databases.map{d => Row(d)} --- End diff -- Will make the change.
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