Unpivot(逆透视(Unpivot))¶
Supported in: Batch, Faster, Streaming
Unpivot is the opposite operation of pivot. This converts multiple columns into rows, transforming data from a wide format to a long format. To do so it creates two new columns: one containing the original column names as values, and another containing the corresponding data values. All other columns that are not unpivoted are kept as is.
Transform categories: Aggregate, Popular
Declared arguments¶
- Columns to unpivot: List of columns to unpivot.
List\> - Dataset: Dataset to perform unpivot on.
Table - Name column: The output column that contains the column names from the original dataset.
Literal\ - Value column: The output column that contains the values from the original dataset.
Literal\
Type variable bounds: T accepts AnyType
Examples¶
Example 1: Base case¶
Argument values:
- Columns to unpivot: [
new_york_miles,london_miles] - Dataset: ri.foundry.main.dataset.a
- Name column: city
- Value column: miles
Input:
| airline | new_york_miles | london_miles |
|---|---|---|
| foundry airways | 1000 | 6000 |
| new air | null | 8000 |
Output:
| city | miles | airline |
|---|---|---|
| new_york_miles | 1000 | foundry airways |
| london_miles | 6000 | foundry airways |
| new_york_miles | null | new air |
| london_miles | 8000 | new air |
Example 2: Base case¶
Argument values:
- Columns to unpivot: [
new_york_miles,london_miles] - Dataset: ri.foundry.main.dataset.a
- Name column: city
- Value column: miles
Input:
| airline | new_york_miles | london_miles | miles |
|---|---|---|---|
| foundry airways | 1000 | 6000 | 0 |
| new air | null | 8000 | 0 |
Output:
| city | miles | airline |
|---|---|---|
| new_york_miles | 1000 | foundry airways |
| london_miles | 6000 | foundry airways |
| new_york_miles | null | new air |
| london_miles | 8000 | new air |
中文翻译¶
逆透视(Unpivot)¶
支持环境:批处理(Batch)、快速处理(Faster)、流处理(Streaming)
逆透视是透视(pivot)的逆向操作。该操作将多列数据转换为行数据,将数据从宽格式(wide format)转换为长格式(long format)。具体实现时,会创建两个新列:一个列包含原始列名作为值,另一个列包含对应的数据值。所有未被逆透视的列将保持原样。
转换类别:聚合(Aggregate)、常用(Popular)
声明参数¶
- 待逆透视列(Columns to unpivot): 需要进行逆透视的列列表。
List\> - 数据集(Dataset): 执行逆透视操作的数据集。
Table - 名称列(Name column): 输出列,包含原始数据集中的列名。
Literal\ - 值列(Value column): 输出列,包含原始数据集中的值。
Literal\
类型变量约束: T 接受任意类型(AnyType)
示例¶
示例 1:基础案例¶
参数值:
- 待逆透视列: [
new_york_miles,london_miles] - 数据集: ri.foundry.main.dataset.a
- 名称列: city
- 值列: miles
输入:
| airline | new_york_miles | london_miles |
|---|---|---|
| foundry airways | 1000 | 6000 |
| new air | null | 8000 |
输出:
| city | miles | airline |
|---|---|---|
| new_york_miles | 1000 | foundry airways |
| london_miles | 6000 | foundry airways |
| new_york_miles | null | new air |
| london_miles | 8000 | new air |
示例 2:基础案例¶
参数值:
- 待逆透视列: [
new_york_miles,london_miles] - 数据集: ri.foundry.main.dataset.a
- 名称列: city
- 值列: miles
输入:
| airline | new_york_miles | london_miles | miles |
|---|---|---|---|
| foundry airways | 1000 | 6000 | 0 |
| new air | null | 8000 | 0 |
输出:
| city | miles | airline |
|---|---|---|
| new_york_miles | 1000 | foundry airways |
| london_miles | 6000 | foundry airways |
| new_york_miles | null | new air |
| london_miles | 8000 | new air |