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New ways to check if queries fold in Power Query

Updated: Jul 19, 2022

First of all we need to give some context to our title.

Most of you will know that if "View Native Query" is greyed out in our transformation protocol in Power Query we know there is no query folding happening.

Since this might be a valid check for SQL Server data sources, it is not a guarantee that your query might fold anyway!

We have tested this e.g. for Snowflake and all queries wered greyed out, even though query folding was happening anyway!

So how can we really check if a query folds?

There is a little code we can add to our Advanced Editor that will give us this answer.

If you add:

    GetMetadata = Value.Metadata(#"MY LAST STEP"),
    QueryFolding = GetMetadata[QueryFolding]

you will either get isFolded = TRUE

or isFolded = FALSE

As alluded to above, we have seen IsFolded = TRUE happening while "View Native Query" was greyed out in the transformation protocol (for a Snowflake data source).

We found this code snippet in a blog post from Chris Webb.

Hopefully this will help you optimize performance for your queries.

UPDATE: In case you get this error when testing for query folding

or in the previous step "GetMetadata" you do not see anything

Make sure to "refresh preview" then you should be able to get a result.

1,985 views4 comments


Neto Borrego
Neto Borrego
May 04, 2023

It was blowing my head that error, thanks for the tip of refresh preview.


A Qavi
A Qavi
Nov 24, 2022

Extremely useful post. Thanks heaps!


Thank you for this very useful post. I appreciate the community contribution.


Klaus Jürgen Folz
Klaus Jürgen Folz
Jan 29, 2022

Thanks for posting

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