Eric5553 commented on a change in pull request #27897: [SPARK-31113][SQL] Add
SHOW VIEWS command
URL: https://github.com/apache/spark/pull/27897#discussion_r402742900
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala
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@@ -295,6 +295,41 @@ 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 VIEWS has three basic columns: namespace, viewName and
isTemporary.
+ override val output: Seq[Attribute] = Seq(
+ AttributeReference("namespace", StringType, nullable = false)(),
+ AttributeReference("viewName", StringType, nullable = false)(),
+ AttributeReference("isTemporary", BooleanType, nullable = false)())
+
+ override def run(sparkSession: SparkSession): Seq[Row] = {
+ val catalog = sparkSession.sessionState.catalog
+ val db = databaseName.getOrElse(catalog.getCurrentDatabase)
+
+ // Show the information of views.
+ val views = tableIdentifierPattern.map(catalog.listViews(db, _))
+ .getOrElse(catalog.listViews(db, "*"))
+ views.map { tableIdent =>
+ val namespace = tableIdent.database.getOrElse("")
Review comment:
Emm, I'll change the `toArray` back to `toSeq` when I get back to my well
configured dev machine...
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