Closure Generator
Description
This step was created to allow you to generate a Reflexive Transitive Closure Table for Mondrian. For more information on how a closure table can help Mondrian gain performance, go here
Technically, this step reads all input rows in memory and calculates all possible parent-child relationships. It attaches the distance (in levels) from parent to child.
Version
This step was first introduced in version 3.0.0-RC1
Screen shots
Options
Option |
Description |
|---|---|
Step name |
The name that uniquely identifies the step. |
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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Example
The example data shown below was taken from the Mondrian help pages on the subject of closure tables.
This transformation is available (from version 3.0.0-RC1) in directory samples/transformations/ in filename "Closure generator - standard mondrian sample.ktr"