scala 从数据框火花中删除一列
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remove a column from a dataframe spark
提问by Count
I have a Spark dataframe with a very large number of columns. I want to remove two columns from it to get a new dataframe.
我有一个包含大量列的 Spark 数据框。我想从中删除两列以获取新的数据框。
Had there been fewer columns, I could have used the select method in the API like this:
如果列较少，我可以像这样在 API 中使用 select 方法：
pcomments = pcomments.select(pcomments.col("post_id"),pcomments.col("comment_id"),pcomments.col("comment_message"),pcomments.col("user_name"),pcomments.col("comment_createdtime"));
But since picking columns from a long list is a tedious task, is there a workaround?
但是由于从长列表中挑选列是一项乏味的任务，是否有解决方法？
回答by SanthoshPrasad
Use dropmethod and withColumnRenamedmethods.
使用drop方法和withColumnRenamed方法。
Example:
例子：
val initialDf= ....
val dfAfterDrop=initialDf.drop("column1").drop("coumn2")
val dfAfterColRename= dfAfterDrop.withColumnRenamed("oldColumnName","new ColumnName")
回答by Manoj Kumar Dhakad
Try this:
试试这个：
val initialDf = ...
val dfAfterDropCols = initialDf.drop("column1", "coumn2")
