Can you explain the concept of Query Folding in Power BI and how it can optimize data loading?


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Noname 1 answer

Query Folding is the process in Power BI where the Power Query engine 'folds' certain data transformation steps back to the data source, allowing the source to perform the operations instead of Power BI. This can significantly improve performance and reduce resource usage.

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John 1 answer

When a query is folded, Power BI sends instructions to the data source instead of processing the data locally. The data source then performs the requested operations and returns only the necessary subset of data back to Power BI. This reduces the amount of data transferred and processed, resulting in faster data loading and query execution.

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Wayne 1 answer

However, not all operations can be folded as they depend on the capabilities of the specific data source. Query Folding works best with databases that support the necessary operations, such as SQL Server. It's important to design queries with this in mind to take advantage of Query Folding and optimize performance.

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