如何将dataFrame数组转换为单个数据框？

Question

我有array个数据框，名为＆＃34; dataFrames＆＃34;看起来像这样：

dataFrames(0)
+----------+--------------------+---------+-------------+
|Periodo   |              frutas|freq     |prods_qty    |
+----------+--------------------+---------+-------------+
|         1|Apple, Watermelon   |        1|            2|
|         1|Banana, StrawBerry  |        2|            2|
+----------+--------------------+---------+-------------+

dataFrames(1)
+----------+--------------------+---------+-------------+
|Periodo   |              frutas|freq     |prods_qty    |
+----------+--------------------+---------+-------------+
|         2|Naranjas, Fresas    |        7|            2|
|         2|Pineapple, Apples   |        9|            2|
+----------+--------------------+---------+-------------+

好吧，我需要像这样得到一个dataframe：

+----------+--------------------+---------+-------------+
|Periodo   |              frutas|freq     |prods_qty    |
+----------+--------------------+---------+-------------+
|         1|Apple, Watermelon   |        1|            2|
|         1|Banana, StrawBerry  |        2|            2|
|         2|Naranjas, Fresas    |        7|            2|
|         2|Pineapple, Apples   |        9|            2|
+----------+--------------------+---------+-------------+

对于此示例，数组的长度为1，但数组可以是任何大小。

可以实现这个......或者我需要将数据帧存储到配置单元表中？

提前致谢

Answer 1

您可以使用reduce将unionAll一个数据框序列或数组放在一起：

val dfs = Array(df1, df2, df3)

val all = dfs.reduce(_ unionAll _)