我如何在Zeppelin/Spark/Scala中打印數據框？

Question

我在Zeppelin 0.7筆記本中使用Spark 2和Scala 2.11。我有一個數據幀，我可以打印這樣的：

dfLemma.select("text", "lemma").show(20,false) 

和輸出的樣子：

+---------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
|text                              |lemma                                         | 
+---------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
|RT @Dope_Promo: When you and your crew beat your high scores on FUGLY FROG https://time.com/Sxp3Onz1w8     |[rt, @dope_promo, :, when, you, and, you, crew, beat, you, high, score, on, FUGLY, FROG, https://time.com/sxp3onz1w8]              | 
|RT @axolROSE: Did yall just call Kermit the frog a lizard? https://time.com/wDAEAEr1Ay          |[rt, @axolrose, :, do, yall, just, call, Kermit, the, frog, a, lizard, ?, https://time.com/wdaeaer1ay]                  | 

我試圖在齊柏林輸出更好，通過：

val printcols= dfLemma.select("text", "lemma") 
println("%table " + printcols) 

它給出了這個輸出：

printcols: org.apache.spark.sql.DataFrame = [text: string, lemma: array<string>] 

和一個新的空白齊柏林款爲首

[text: string, lemma: array] 

有沒有得到數據幀顯示爲一個很好的格式化表格的方式嗎？ TIA！ TIA！

Answer 1

在Zeppelin中，您可以使用z.show(df)來顯示一張漂亮的桌子。這裏有一個例子：

val df = Seq(
    (1,1,1), (2,2,2), (3,3,3) 
).toDF("first_column", "second_column", "third_column") 

z.show(df)