maropu commented on a change in pull request #27897: [SPARK-31113][SQL] Add
SHOW VIEWS command
URL: https://github.com/apache/spark/pull/27897#discussion_r392732231
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala
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@@ -280,6 +280,44 @@ case class AlterViewAsCommand(
}
}
+/**
+ * A command for users to get views in the given database.
+ * If a databaseName is not given, the current database will be used.
+ * The syntax of using this command in SQL is:
+ * {{{
+ * SHOW VIEWS [(IN|FROM) database_name] [[LIKE] 'identifier_with_wildcards'];
+ * }}}
+ */
+case class ShowViewsCommand(
+ databaseName: Option[String],
+ tableIdentifierPattern: Option[String]) extends RunnableCommand {
+
+ // The result of SHOW TABLES/SHOW TABLE has three basic columns: database,
tableName and
+ // isTemporary. If `isExtended` is true, append column `information` to the
output columns.
+ override val output: Seq[Attribute] = Seq(
+ AttributeReference("database", StringType, nullable = false)(),
+ AttributeReference("viewName", StringType, nullable = false)(),
+ AttributeReference("isTemporary", BooleanType, nullable = false)())
+
+ override def run(sparkSession: SparkSession): Seq[Row] = {
+ // Since we need to return a Seq of rows, we will call getTables directly
+ // instead of calling tables in sparkSession.
Review comment:
ditto
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