dongjoon-hyun commented on a change in pull request #23883: [SPARK-26982][SQL]
Enhance describe framework to describe the output of a query.
URL: https://github.com/apache/spark/pull/23883#discussion_r261485376
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala
##########
@@ -516,6 +505,35 @@ case class DescribeTableCommand(
new MetadataBuilder().putString("comment", "comment of the
column").build())()
)
+ protected def describeSchema(
+ schema: StructType,
+ buffer: ArrayBuffer[Row],
+ header: Boolean): Unit = {
+ if (header) {
+ append(buffer, s"# ${output.head.name}", output(1).name, output(2).name)
+ }
+ schema.foreach { column =>
+ append(buffer, column.name, column.dataType.simpleString,
column.getComment().orNull)
+ }
+ }
+
+ protected def append(
+ buffer: ArrayBuffer[Row], column: String, dataType: String, comment:
String): Unit = {
+ buffer += Row(column, dataType, comment)
+ }
+}
+/**
+ * Command can of the following form.
Review comment:
`can of the` -> `can be the`?
Otherwise, shall we reuse the previous description, `Command that looks
like`?
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