Input streams and windows accept data from a source external to the project.
You can create an input stream or window by adding an adapter that supports schema discovery, and generating the stream or window to inherit the schema of the external data source automatically. You can then add columns as needed.
- In the Visual editor workspace, in the Palette menu under the Streams and Windows category, select either:
- Input Stream
- Input Window
- Input Stream
- Select a location in the diagram and click to add the shape.
- To set the name of the input stream or window, either:
- Click to edit the shape name, or,
- In verbose mode, click the Edit icon next to the name.
- Click Add Column
to add each new column to the schema, then set key columns and edit column expressions.
- To delete columns, select them and press Delete.
- (Optional for windows, not permitted for streams) Select Set Keep Policy
and choose an option.
- (Optional) Double-click the policy to edit its parameters.
