Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/999#discussion_r13892635
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala
---
@@ -123,4 +125,53 @@ abstract class QueryPlan[PlanType <:
TreeNode[PlanType]] extends TreeNode[PlanTy
case other => Nil
}.toSeq
}
+
+ protected def generateSchemaTreeString(schema: Seq[Attribute]): String =
{
+ val builder = new StringBuilder
+ builder.append("root\n")
+ val prefix = " |"
+ schema.foreach { attribute =>
+ val name = attribute.name
+ val dataType = attribute.dataType
+ dataType match {
+ case fields: StructType =>
+ builder.append(s"$prefix-- $name: $StructType\n")
+ generateSchemaTreeString(fields, s"$prefix |", builder)
+ case ArrayType(fields: StructType) =>
+ builder.append(s"$prefix-- $name: $ArrayType[$StructType]\n")
+ generateSchemaTreeString(fields, s"$prefix |", builder)
+ case ArrayType(elementType: DataType) =>
+ builder.append(s"$prefix-- $name: $ArrayType[$elementType]\n")
+ case _ => builder.append(s"$prefix-- $name: $dataType\n")
+ }
+ }
+
+ builder.toString()
+ }
+
+ protected def generateSchemaTreeString(
+ schema: StructType,
+ prefix: String,
+ builder: StringBuilder): StringBuilder = {
+ schema.fields.foreach {
+ case StructField(name, fields: StructType, _) =>
+ builder.append(s"$prefix-- $name: $StructType\n")
+ generateSchemaTreeString(fields, s"$prefix |", builder)
+ case StructField(name, ArrayType(fields: StructType), _) =>
+ builder.append(s"$prefix-- $name: $ArrayType[$StructType]\n")
+ generateSchemaTreeString(fields, s"$prefix |", builder)
+ case StructField(name, ArrayType(elementType: DataType), _) =>
+ builder.append(s"$prefix-- $name: $ArrayType[$elementType]\n")
+ case StructField(name, fieldType: DataType, _) =>
+ builder.append(s"$prefix-- $name: $fieldType\n")
+ }
+
+ builder
+ }
+
+ /** Returns the output schema in the tree format. */
+ def schemaTreeString: String = generateSchemaTreeString(output)
--- End diff --
maybe just schemaString
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