Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/999#discussion_r13518263
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/package.scala
---
@@ -17,8 +17,56 @@
package org.apache.spark.sql.catalyst
+import org.apache.spark.sql.catalyst.expressions.Attribute
+import org.apache.spark.sql.catalyst.types.{StructField, DataType,
ArrayType, StructType}
+
/**
* A a collection of common abstractions for query plans as well as
* a base logical plan representation.
*/
-package object plans
+package object plans {
+ 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()
+ }
+
+ def generateSchemaTreeString(
--- End diff --
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