The Debug Query mode for a calculation view is a specific analysis tool within the SAP HANA development environment. Its primary purpose is to help developers understand how the SAP HANA optimizer executes a specific SQL query against the view. It visually displays the logical model of the calculation view and highlights which nodes (data sources) were actually accessed and which were "pruned." Pruning is an optimization technique where the engine avoids reading from data sources that are not necessary to satisfy the columns and filters of the query, significantly improving performance.

A. To set breakpoints and step through the execution

This describes the functionality of the SQLScript Debugger, which is used for debugging procedural code within procedures, functions, or calculation view script nodes, not for analyzing the data flow of the entire graphical view.

C. To understand how tables are partitioned

Table partitioning is a physical storage characteristic. Information about partitioning is found in system views (e.g., MTABLEPARTITIONS) or through database administration tools, not the calculation view debugger.

D. To check which database engines are invoked

While related to performance, the detailed breakdown of which engines (OLAP, Join, Calculation Engine) are used for specific operations is best seen using the "Visualize Plan" or "Explain Plan" features.

1. SAP HANA Cloud

SAP HANA Database Modeling Guide for SAP Web IDE for SAP HANA:

In the section "Analyzing Queries on Calculation Views

" the subsection "Debug a Calculation View" states: "You can use the debug query feature to analyze an SQL query on a calculation view... The debugger helps you understand the data flow in the calculation view nodes and to identify the nodes that are not executed (pruned nodes) for a given SQL query." This directly supports the function of identifying un-accessed data sources.

2. SAP HANA Modeling Guide for SAP HANA Studio (SPS 12):

Section 5.1.10.2

"Debugging Calculation Views

" explains: "The debugger helps you understand the data flow in the calculation view nodes and to identify the nodes that are not executed (pruned nodes) for a given SQL query." This confirms that identifying pruned nodes is the key feature.

3. SAP HANA SQLScript Reference:

The section on "Debugging SQLScript" details the procedure for setting breakpoints and stepping through code

which clearly distinguishes it from the Debug Query mode for graphical views

thereby invalidating option A.