# Add value fields changing sequence

## ![](/files/VGJa9UxeVgiaNkB1KcKJ) Add value fields changing sequence

### Description <a href="#description" id="description"></a>

The Add Fields Changing Sequence transform simply adds a sequence value which resets each time a value changes in the list of specified fields.

### Supported Engines <a href="#supported_engines" id="supported_engines"></a>

| Hop Engine | <sup>✓</sup> |
| ---------- | ------------ |
| Spark      | X            |
| Flink      | X            |
| Dataflow   | X            |

### Options

Here are the options for the transform:

* transform name : the name of the transform, needs to be unique in a pipeline
* Result field: the name of the output field, the sequence
* Start at value: the number to start at each time
* Increment by: the value to increase at each row in the same group
* Init sequence if value of following fields change: you can specify a list of fields here. If a value in one or more of these fields changes compared to the previous rows, the sequence will be reset to the start value.


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