Github user dilipbiswal commented on a diff in the pull request:
https://github.com/apache/spark/pull/11991#discussion_r57799009
--- 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
--- End diff --
OK.
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