我有一个带有schema的struct：

root
 |-- id: long (nullable = true)
 |-- products: array (nullable = true)
 |    |-- element: struct (containsNull = true)
 |    |    |-- id: integer (nullable = true)
 |    |    |-- name: string (nullable = true)
 |    |    |-- created_at: long (nullable = true)
 |    |    |-- updated_at: long (nullable = true)
 |    |    |-- product_color: array (nullable = true)
 |    |    |    |-- element: struct (containsNull = true)
 |    |    |    |    |-- id: integer (nullable = true)
 |    |    |    |    |-- color: string (nullable = true)
 |    |    |    |    |-- created_at: long (nullable = true)
 |    |    |    |    |-- updated_at: long (nullable = true)
 |    |    |    |    |-- products_id: long (nullable = true)
 |    |    |-- orders_id: long (nullable = true)

现在，我想创建一个带有product\颜色的新列，以便在我的数据框中添加一个新列，如

df.withColumn("product_color", col(currentNode + "." + fieldName))

使用新列模式：

root
 |-- id: long (nullable = true)
 |-- products: array (nullable = true)
 |    |-- element: struct (containsNull = true)
 |    |    |-- id: integer (nullable = true)
 |    |    |-- name: string (nullable = true)
 |    |    |-- created_at: long (nullable = true)
 |    |    |-- updated_at: long (nullable = true)
 |    |    |-- product_color: array (nullable = true)
 |    |    |    |-- element: struct (containsNull = true)
 |    |    |    |    |-- id: integer (nullable = true)
 |    |    |    |    |-- color: string (nullable = true)
 |    |    |    |    |-- created_at: long (nullable = true)
 |    |    |    |    |-- updated_at: long (nullable = true)
 |    |    |    |    |-- products_id: long (nullable = true)
 |    |    |-- orders_id: long (nullable = true)
 |-- product_color: array (nullable = true)
 |    |-- element: array (containsNull = true)
 |    |    |-- element: struct (containsNull = true)
 |    |    |    |-- id: integer (nullable = true)
 |    |    |    |-- color: string (nullable = true)
 |    |    |    |-- created_at: long (nullable = true)
 |    |    |    |-- updated_at: long (nullable = true)
 |    |    |    |-- products_id: long (nullable = true)

如果查看产品颜色的模式，则会添加一个数组元素。

|-- element: array (containsNull = true)

我正在寻找帮助，以了解如何创建一个新的列与确切的模式，因为它是在产品结构。
预期架构：

root
 |-- id: long (nullable = true)
 |-- products: array (nullable = true)
 |    |-- element: struct (containsNull = true)
 |    |    |-- id: integer (nullable = true)
 |    |    |-- name: string (nullable = true)
 |    |    |-- created_at: long (nullable = true)
 |    |    |-- updated_at: long (nullable = true)
 |    |    |-- product_color: array (nullable = true)
 |    |    |    |-- element: struct (containsNull = true)
 |    |    |    |    |-- id: integer (nullable = true)
 |    |    |    |    |-- color: string (nullable = true)
 |    |    |    |    |-- created_at: long (nullable = true)
 |    |    |    |    |-- updated_at: long (nullable = true)
 |    |    |    |    |-- products_id: long (nullable = true)
 |    |    |-- orders_id: long (nullable = true)
 |-- product_color: array (nullable = true)
 |    |-- element: struct (containsNull = true)
 |    |    |-- id: integer (nullable = true)
 |    |    |-- color: string (nullable = true)
 |    |    |-- created_at: long (nullable = true)
 |    |    |-- updated_at: long (nullable = true)
 |    |    |-- products_id: long (nullable = true)

spark:2.4.5语言：scala