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Frequent Visitor

Applied Steps and Re-quering Data Source

Using Power Query, each time you change a field type or expand a column does the step result in the data source being re-queried?

 

Steps:
connect to a data source

filter rows

change column type

expand column

 

Would the steps outlined above result in one query back to the data source or multiple?

1 REPLY 1
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Super User II
Super User II

Usually one (there are some exceptions for schema retrieval - https://blog.crossjoin.co.uk/2020/07/05/why-is-power-bi-running-my-sql-query-twice/ )

 

BUT- oftentimes it also results in zero queries for some steps when Query Folding is active.  That means any previous steps are combined into one native query.

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