Where can you create a filter expression?

Creating a filter expression is most commonly accomplished in a Projection node. The Projection node is primarily used to refine the data set by selecting specific columns and applying calculations or filters to the data. When designing a model in SAP HANA, this node allows users to define the precise data attributes they want to work with, which includes filtering records based on specified criteria.

The functionality of a Projection node is essential for optimizing the data model and ensuring that only relevant data is processed in subsequent steps. By applying filter expressions here, users are able to control the data flows into reporting or analytical scenarios more efficiently. This is particularly advantageous for improving performance and focusing analysis on pertinent data.

In contrast, while other nodes such as the Data Foundation, Aggregation, and Semantics nodes have specific functionalities related to data management, summary operations, and metadata handling, they do not provide the direct mechanism for creating filter expressions in the same way a Projection node does. This distinction is crucial for effectively designing and managing data flows within SAP HANA.