+-----------------------------------------------------------------------------------------------------------------------------------------------+
|Texts                                                                                                                                          |
+----------------------------------------------------------------------------------------------------------------------------------------------+
|RT @xxxxxx: post aqwe qwqq ssdd qaAQ WQWQW CSDWDW!!! 

must RT !                                                                                                                                      |
|RT @xxxxx: aaa in ssss ssss ss sqqq this qqq in "sss" should xxxx xx at xx xaaaa aqw   |
|RT @xxxx: QWW sadad jkhj to hjyhy a eryr rrryryry? ersfsfdsgdgdgg t rtrt ytyyryr.

sadwf wwewe ewewe jyiopo;l dwewre etet of the ddgdg-we dfdfdf, @b…                                                                              |
+-----------------------------------------------------------------------------------------------------------------------------------------------+

我想使用scala和spark在一个列表的text列中设置这些行的值。

1. val newList =   myDataframe.select("Texts").rdd.map(_(0)).collect.toList
2. val newList =   myDataframe.select("Texts").collect().map(_(0)).toList
   newList .foreach(println)

这两种方法都不会给出任何输出，程序也不会终止。不会抛出错误。
预期产量

["RT @xxxxxx: post aqwe qwqq ssdd qaAQ WQWQW CSDWDW!!! must RT !", "RT @xxxxx: aaa in ssss ssss ss sqqq this qqq in "sss" should xxxx xx at xx xaaaa aqw", "RT @xxxx: QWW sadad jkhj to hjyhy a eryr rrryryry? ersfsfdsgdgdgg t rtrt ytyyryr.

sadwf wwewe ewewe jyiopo;l dwewre etet of the ddgdg-we dfdfdf, @b…"]

请注意，dataframe中每行的句子可能包含新行
如 I am going to the the shop.\n Its very expensive 这句话将显示为

I am going to the shop
 its very expensive

但两者将属于同一行。