Information noteNote: This feature is available only if you have installed the R2020-04 Studio
monthly update or a later one delivered by Talend. For more information, check with
your administrator.
Before you begin
You have created a hierarchical structure.
About this task
In this example, the input hierarchical structure looks like this:
Procedure
In the Data Mapper tab
of the Mapping perspective, right-click Maps in Hierarchical
Mapper and click New > Map.
Select Flattening Map - Create a map which flattens an input
structure and click Next.
Select a folder and enter a name for the map, then click
Next.
Select the structure that you want to flatten and click
Next.
Select a folder and enter a name for the new structure, then click
Next.
Optional: Change the pivot by right-clicking the relevant node and
clicking Set Pivot.
The pivot is a path of nodes that starts at the root node and ends at a leaf node. The
selected pivot determines the number of rows in the flattened structure.
You can also remove a node from the pivot by right-clicking it and clicking
Remove From Pivot.
Optional: Change the value of
the Max Occurs attribute for elements that are not
in the pivot.
Click the Set Max Occurs for all repeatable
elements button to change the value for all repeatable
elements.
Select one or several nodes and right-click them, then select Set Max Occurs and enter a number. You can
select the Apply max occurs to descendant(s) check box
if you want to apply this setting to all the descendants of the nodes you
selected, then click OK.
Optional: Click the
Filter primitive fields button to disable the
filter and show all non-looping elements.
This filter is
enabled by default and all primitive fields are included in the output
structure. If you want to exclude some of these elements, you can disable
the filter and clear the relevant check boxes.
Click Next, select the
Create a Studio schema from the flattened
structure check box if needed, then click Finish.
Information noteNote: If you select this check box, the output structure will use the
Map representation by default. If you clear it,
the output will use the CSV representation.
Results
Your map and your flattened output structure are created in the selected
folders. The map opens and the elements from the input structure are automatically
mapped with the elements in the flat output structure.
In this example, it looks like this:
If you selected Create a Studio schema from the
flattened structure, a schema containing the same columns is
created. You can find it in your Repository
in the Integration perspective, under Metadata > Generic schemas.
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