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FYI:
I found these links (which have been removed from the current documentation without being replaced):
https://github.com/microsoft/DataConnectors/blob/00b30f78143873b0bff60335ed53069288aad6db/docs/table... (in an older version of DataConnectors repo)
Query folding handlers are a set of functions in PowerBI's data connector API that allow you to control how data is transferred from a data source to PowerBI. The most commonly used query folding handlers include:
The most important handlers to implement depend on the specific use case and the requirements of your data source. However, to support Direct Query, the OnSelectRows and OnGetRows handlers are important. To support Incremental Refresh, the OnGetRows and OnGetSchema handlers are important.
When deciding which handlers to implement, consider the following factors:
It's recommended to consult the PowerBI documentation and reach out to the PowerBI support team for more information on query folding handlers and best practices for implementation.
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