Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/12133#discussion_r58314666
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
---
@@ -374,6 +374,54 @@ 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] = {
--- End diff --
MINOR/NIT: This is still more elaborate than it needs to be. Why not:
val schema = AttributeReference("value", StringType, nullable =
false)() :: Nil
propertyKey match {
case None => AttributeReference("key", StringType, nullable =
false)() :: schema
case _ => schema
}
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