|
Adding a Union Operator
Used to perform a union of two streams. Both streams would need the same schema. Otherwise, the output would be the combination of both, with missing values returned as Null.
Steps:
1. In the Application page, click
and
select Union 
in
the Add Operator pane.
The
Union node 
icon displays in the Graph
panel, as well as the properties to be defined in the Operator
Settings panel, and the preview of the data in the Schema
panel.
The left (inbound) edges allow you to select the input streams. The right (outbound) edge allows you to connect to the other operators.
2. In the Operator Settings panel, define or select the following required properties:
|
Property |
Description |
|
Node ID |
The ID the union operator. |
|
Inputs |
The left input stream automatically connects to the currently-selected operator. You can select another ID of the operator that will be the source of the data in the Inputs drop-down list. Then select the right input stream. The preview of the data (LEFT, RIGHT and OUTPUT) is displayed in the Schema panel. |
3. Save the changes.