# Closure

## ![](/files/xGSM6UfKkiodacXgZh8E) Closure

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

The Closure transform allows you to generate a Reflexive Transitive Closure Table for the Mondrian OLAP engine. For more information on how a closure table can help Mondrian gain performance, go here Technically, this transform reads all input rows in memory and calculates all possible parent-child relationships. It attaches the distance (in levels) from parent to child.

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

### Options

| Option              | Description                                                                          |
| ------------------- | ------------------------------------------------------------------------------------ |
| Transform name      | The name that uniquely identifies the transform.                                     |
| Parent ID field     | The field name that contains the parent ID of the parent-child relationship.         |
| Child ID field      | The field name that contains the child ID of the parent-child relationship.          |
| Distance field name | The name of the distance field that will be added to the output                      |
| Root is zero        | Check this box if the root of the parent-child tree is not empty (null) but zero (0) |


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