[GitHub] [spark] dongjoon-hyun opened a new pull request #24098: [SPARK-27166][SQL] Improve `printSchema` to print up to the given level

[GitBox <gi...@apache.org>]

dongjoon-hyun opened a new pull request #24098: [SPARK-27166][SQL] Improve `printSchema` to print up to the given level
URL: https://github.com/apache/spark/pull/24098
 
 
   ## What changes were proposed in this pull request?
   
   This PR aims to improve `printSchema` to be able to print up to the given level of the schema.
   
   ```scala
   scala> val df = Seq((1,(2,(3,4)))).toDF
   df: org.apache.spark.sql.DataFrame = [_1: int, _2: struct<_1: int, _2: struct<_1: int, _2: int>>]
   
   scala> df.printSchema
   root
   |-- _1: integer (nullable = false)
   |-- _2: struct (nullable = true)
   | |-- _1: integer (nullable = false)
   | |-- _2: struct (nullable = true)
   | | |-- _1: integer (nullable = false)
   | | |-- _2: integer (nullable = false)
   
   scala> df.printSchema(1)
   root
   |-- _1: integer (nullable = false)
   |-- _2: struct (nullable = true)
   
   scala> df.printSchema(2)
   root
   |-- _1: integer (nullable = false)
   |-- _2: struct (nullable = true)
   | |-- _1: integer (nullable = false)
   | |-- _2: struct (nullable = true)
   
   scala> df.printSchema(3)
   root
   |-- _1: integer (nullable = false)
   |-- _2: struct (nullable = true)
   | |-- _1: integer (nullable = false)
   | |-- _2: struct (nullable = true)
   | | |-- _1: integer (nullable = false)
   | | |-- _2: integer (nullable = false)
   ```
   
   ## How was this patch tested?
   
   Pass the Jenkins with the newly added test case.

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