dongjoon-hyun commented on a change in pull request #24098: [SPARK-27166][SQL]
Improve `printSchema` to print up to the given level
URL: https://github.com/apache/spark/pull/24098#discussion_r369848240
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala
##########
@@ -310,13 +310,19 @@ case class StructType(fields: Array[StructField])
extends DataType with Seq[Stru
protected[sql] def toAttributes: Seq[AttributeReference] =
map(f => AttributeReference(f.name, f.dataType, f.nullable, f.metadata)())
- def treeString: String = {
+ def treeString: String = treeString(Int.MaxValue)
+
+ def treeString(level: Int): String = {
val builder = new StringBuilder
builder.append("root\n")
val prefix = " |"
fields.foreach(field => field.buildFormattedString(prefix, builder))
- builder.toString()
+ if (level <= 0 || level == Int.MaxValue) {
+ builder.toString()
+ } else {
+ builder.toString().split("\n").filter(_.lastIndexOf("|--") < level * 5 +
1).mkString("\n")
Review comment:
Got it. Let me think about that way.
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