dilipbiswal 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_r261490182
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala
##########
@@ -603,22 +621,22 @@ case class DescribeTableCommand(
}
table.storage.toLinkedHashMap.foreach(s => append(buffer, s._1, s._2, ""))
}
+}
- private 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)
- }
- }
+/**
+ * Command can of the following form.
+ * {{{
+ * DESCRIBE [QUERY] query_statement
Review comment:
@dongjoon-hyun Now we support statements of the form :
1) SELECT
2) SELECTS wrapped under a set op (union/intersect etc)
3) VALUES(....)
4) TABLE <tabName>
Thats why i didn't use select_statement.. Any other name you can think of ?
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