Github user OopsOutOfMemory commented on a diff in the pull request: https://github.com/apache/spark/pull/4127#discussion_r23359441 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/commands.scala --- @@ -178,3 +180,34 @@ case class DescribeCommand( child.output.map(field => Row(field.name, field.dataType.toString, null)) } } + +/** + * :: DeveloperApi :: + */ +@DeveloperApi +case class DDLDescribeCommand( + dbName: Option[String], + tableName: String, isExtended: Boolean) extends RunnableCommand { + + override def run(sqlContext: SQLContext) = { + val tblRelation = dbName match { + case Some(db) => UnresolvedRelation(Seq(db, tableName)) + case None => UnresolvedRelation(Seq(tableName)) + } + val logicalRelation = sqlContext.executePlan(tblRelation).analyzed + val rows = new ArrayBuffer[Row]() + rows ++= logicalRelation.schema.fields.map{field => + Row(field.name, field.dataType.toSimpleString, null)} + + /* + * TODO if future support partition table, add header below: + * # Partition Information + * # col_name data_type comment --- End diff -- @marmbrus yeah, I understand your concern. I refereed hive's describe implementation. We should provide a `getPartitionedColumns` method in partition table. Maybe the partition info description can be done after [SPARK-5182](https://issues.apache.org/jira/browse/SPARK-5182). What about just make the PR only do `describe table`. After [SPARK-5182](https://issues.apache.org/jira/browse/SPARK-5182) , we can do `extended` operation and show partition columns info ? /cc @rxin
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