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Anonymous
Not applicable

Filter Gallery - two columns in same SharePoint list are equal to each other (without delegation)

I'm struggling here with something that feels like it should be simple but also a bit unusual.

 

I have a SharePoint list in which it is meaningful to be able to filter down to where one column's value is equal to another column's value - these columns are both in the same list.

 

So as simple as 

Filter(SharePointDataSource,columnA = columnB)

 

But it doesn't return any data and returns an error 'Fetching Items failed. Possible invalid string in filter query.' 

 

Which seems quite cut and dry I guess - I'm trying to achieve something that is unsupported by Power Apps? 

 

Except as soon as I wrap one of the column names in a function, it does return items! Although it also shows the expected delegation warnings ,which I need to avoid with this dataset as it is large. e.g. Trim(columnA) = columnB.... or Text(columnA,"") = columnB both work. Othernon-delegable alternatives like columnA in columnB work!

 

The same function on a local collection works too! i.e. Filter(colLocalData,columnA = columnB)

 

I'm a bit stumped and feel like I've hit a dead end. I'd at least like to understand why SharePoint can't handle a filter with delegable functions (equals, >, <, etc) on two columns in the same table?  Or if anyone else has a more clever way to reach the outcome without excessive work arounds.

4 REPLIES 4
Matren
Super User
Super User

Hi @Anonymous,

 

Yes, you are running into delegation warnings. I recommend you add a calculated field in SP whose value is true when the columns are equal. FYI, it can handle operators like "=2"; however, "= another column" is currently not delegable.

 

Best Wishes,

Matren

 

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Anonymous
Not applicable

Thanks for your idea Matren. However unfortunately calculated fields in SharePoint are also not delegable. I've tested it now and using a SP calculated field in this way (column = another column) doesn't return any results whatsoever in my power apps items filter. This is regardless of whether I make the calculated column result in a true / false, yes / no or even numbers like 1 / 0.

 

The limitation seems more fundamental...

Hi @Anonymous,

 

After making the calculated column in SharePoint, which would result in "True" for every time the two columns were equivalent, did you try with the following code:

 

Filter(SharePointDataSource,calculatedcolumnname = "True")

 

If so, what about trying the following workaround: 

 

Create a text column and use power automate to set the value of it as per calculated formula. So whenever new item is added or edited, that column will be updated. You would also want to create an index in SharePoint on that column so it could be quickly retrieved.

 

Best Wishes,

Matren

 

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Anonymous
Not applicable

In the end I took a different approach with my data due to the limitation. Thanks for your efforts @Matren

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