Github user dilipbiswal commented on a diff in the pull request:
https://github.com/apache/spark/pull/12133#discussion_r58308812
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
---
@@ -374,6 +374,52 @@ case class ShowDatabasesCommand(databasePattern:
Option[String]) extends Runnabl
}
/**
+ * A command for users to list the properties for a table.
+ * If propertyKey is specified, the value for the propertyKey
+ * is returned. If propertyKey is not specified, all the keys
+ * and their corresponding values are returned.
+ * The syntax of using this command in SQL is:
+ * {{{
+ * SHOW TBLPROPERTIES table_name[('propertyKey')];
+ * }}}
+ */
+case class ShowTablePropertiesCommand(
+ table: TableIdentifier,
+ propertyKey: Option[String]) extends RunnableCommand {
+
+ override val output: Seq[Attribute] = {
+ val withKeySchema: Seq[Attribute] = {
+ AttributeReference("value", StringType, nullable = false)() :: Nil
+ }
+ val noKeySchema: Seq[Attribute] = {
+ AttributeReference("key", StringType, nullable = false)() ::
+ AttributeReference("value", StringType, nullable = false)() :: Nil
+ }
+ propertyKey.map(p => withKeySchema).getOrElse(noKeySchema)
+ }
+
+ override def run(sqlContext: SQLContext): Seq[Row] = {
+ val catalog = sqlContext.sessionState.catalog
+
+ if (catalog.isTemporaryTable(table)) {
+ throw new AnalysisException("This operation is unsupported for
temporary tables")
+ }
+ val catalogTable = sqlContext.sessionState.catalog.getTable(table)
--- End diff --
Its documented [here]
(https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala#L28-L35)
Its good to also add it in the SessionCatalog.getTable doc. I will add a
comment.
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