Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4227#discussion_r24147699
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/commands.scala ---
@@ -174,9 +175,19 @@ case class UncacheTableCommand(tableName: String)
extends RunnableCommand {
@DeveloperApi
case class DescribeCommand(
child: SparkPlan,
- override val output: Seq[Attribute]) extends RunnableCommand {
+ override val output: Seq[Attribute],
+ isExtended: Boolean) extends RunnableCommand {
override def run(sqlContext: SQLContext) = {
- child.output.map(field => Row(field.name, field.dataType.toString,
null))
+ val rows = new ArrayBuffer[Row]()
+ rows ++= child.schema.fields.map{field =>
--- End diff --
why not just
```scala
child.schema.fields.map { field =>
val comment = if (field.metadata.contains("comment"))
field.metadata.get("comment") else ""
Row(field.name, field.dataType.toSimpleString, comment)
}
```
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