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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