如何在 Zeppelin/Spark/Scala 中漂亮地打印一个包装阵列? [英] How can I pretty print a wrappedarray in Zeppelin/Spark/Scala?

问题描述

在

我已经试过了:

z.show(dfLemma.select(concat_ws(",", $"lemma")))

但它只是给了我一个单词列表，格式不正确，我还希望在我的输出中包含种族主义列.非常感谢任何帮助.

but it just gave me a list of words, not nicely formatted and I also want the racist column in my output. Any help is much appreciated.

推荐答案

以下是格式化数组列的建议:

Here's a suggestion for formatting your array column:

import org.apache.spark.sql.Column
import org.apache.spark.sql.functions._
import sqlContext.implicits._

val df = Seq(
  (1, Array("An", "Array")), (2, Array("Another", "Array"))
).toDF("first", "second")

def formatArrayColumn(arrayColumn: Column): Column = {
  concat(lit("["), concat_ws(", ", arrayColumn), lit("]")).as(s"format(${arrayColumn.expr})")
}

val result = df.withColumn("second", formatArrayColumn($"second"))

z.show(result)

结果:

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