In SAP HANA, when working with Graphical Calculation Views, the modeling environment primarily provides support for left and right joins, but cross joins between two nodes are not directly available in the graphical editor. However, you can achieve a cross join effect by using specific techniques within your Graphical Calculation View. Here's a workaround to perform a cross join:
Create Separate Projection Nodes:
Create two separate projection nodes for the tables or data sources that you want to cross join.
Use a Calculated Column for Join:
Create a calculated column in each projection node that assigns a constant value. This constant value will be used as a placeholder for a cross join.
Perform Left and Right Joins:
Use left and right joins based on the calculated constant column in both projection nodes to simulate a cross join. Since the constant value is the same in both tables, it effectively creates a cross join effect.
Adjust Projection Node Output:
Adjust the projection nodes' output by excluding or renaming the constant column, as it was only used for the join.
This approach simulates a cross join by using a constant value in the join condition, essentially matching every row from the first projection node with every row from the second projection node. While this method achieves the desired result, be cautious about performance implications, especially when dealing with large datasets, as it may lead to a Cartesian product. It's recommended to test and optimize accordingly based on your specific use case.