Pushing transformations back to the data source means they almost always perform better.

What is query folding. This works only for some data sources, namely. Query folding is the ability for a power query query to generate a single query statement that retrieves and transforms source data. When a query gets executed, it tries to fetch the data from the data source as one of its first steps.

Direct query and dual storage mode. Query folding is a way to allow power bi (its engine) to push some of the transformations done in power query back to the database, and let it do what it’s good at. The inputs to query folding are (1) a definition for a query relation in terms of a master schema and (2) definitions for the available source relations expressed in terms of the same master.

Query folding is the mechanism to push power query transformations back to the source to reduce the load of power query. In the previous part of the series, we explained what is query folding, which data sources support it, and which transformations within the data source itself. Beginners power query is a product that allows business users to extract data from any source, cleanse and transform that data, and then load the modified data to a new location,.

Query folding is generally a good thing in power query: If the power query engine is able to gather all your transformations and. That’s not always the case.

Essentially, any data source that supports some kind of querying language, can. What data is fetched from the data source is defined by the. However, it`s not just that sql databases take advantage of the query folding concept.

Importance of query folding data refresh will take place efficiently for import mode tables in terms of resource utilization and refresh duration. In short, query folding is the process where the m query code gets translated into the native query language of a data source. This query took 4 minutes and 41 seconds to load into our power bi report, which is approximately 10 times more than in our previous case when the.