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PaulD1
Community Champion
Community Champion

Bug? Non Delegable Formula NOT marked with blue dot (Azure SQL DB)

I'm trying to do various data-manipulation 'gymnastics' to try to work around the fact that PowerApps cannot currently use SQL Views and my data is normalised.

 

After much trial and error, I came up with the following which was not marked as non-delegable (no blue dot):

 

GroupBy(Filter(AddColumns(AddColumns('[Order].[OrderDetail]',"MyMenuCategoryID", LookUp(LocalMenuItem, MenuItemID = '[Order].[OrderDetail]'[@MenuItemID],MenuCategoryID)),"MyPreparedInKitchen",LookUp(LocalMenuCategory, CategoryID = MyMenuCategoryID,PreparedInKitchen)),MyPreparedInKitchen = true && OrderDetailTimeInt >= varTodayTimeInt )   ,"OrderHeaderID","GrpOrderByHeader")

(for anyone interested, the OrderDetail table contains a MenuItemID which appears in the MenuItem table, this has a MenuCategoryID which appears in the MenuCategory table and has a column 'PreparedInKitchen' which I need to filter my results by, in addition to limiting them to orders placed today).

 

This was working great until I hit the 500 record limit at which it has become clear that only the first 500 records in OrderDetail are being considered.

 

We really need a reliable way of checking whether a formula is delegable or not without having to generate lots of dummy data to test against.

 

If anyone knows of a good way to check the delegable state of a formula, please let me know...

 

Cheers

Paul

5 REPLIES 5
Delid4ve
Impactful Individual
Impactful Individual

May have blue writing instead of blue dot.

Best workarounds I can suggest is filtering the tables into collections, or, as I've had to do:

Create a new table in SQL manually using a create table query for your formula with all the columns you need.

create a stored procedure in SQL to carry out your query each night (say midnight) and either append the table or truncate it and run the insert statement again.

set up a flow to execute the stored procedure on a schedule at midnight

this way you can just use the new table in PowerApps.

 

PaulD1
Community Champion
Community Champion

Hi @Delid4ve

 

There was no blue underlining, text or dot. I've been double-checking every formula as I create it to ensure that it is delegable.

 

Filtering tables into local collections is the route I've taken. Fortunately, I can filter into local collections as the filters on the individual tables are delegable and I do not expect more than 500 results from any filter.

 

Stored Proc won't work for me as my data is 'live' (this is part of a system for a restaurant - servers take orders in one app and those orders then show up in another app in the kitchen so the chef knows what orders to prepare). I have a timer which refreshes my collections every minute - seems to be working so far in testing... 

A blue dot should usually show up if you are using a query which is not delegatable (when the actual data source does support delegation)

 

Also, here is the link which has the delegatable calls listed

 

https://docs.microsoft.com/en-us/powerapps/delegation-list  

PaulD1
Community Champion
Community Champion

Thanks @mayuro 

 

>>A blue dot should usually show up if you are using a query which is not delegatable (when the actual data source does support delegation)

 

This is my point - the blue dot is not consistent/reliable. In the example given, there was no blue dot but only the first 500 records were considered by the filter. When I modified my application to filter first into a collection and then perform the AddColumns, LookUps and GroupBy on the collection, all was well.

 

I suspect the issue is filtering by a column added to a data source via a LookUp (even though both Filter and LookUp support delegation for SQL Server).

 

Until PowerApps supports SQL Server Views (please be soon!) we have to do a lot of data manipulation in PowerApps. If we cannot rely on the non-delegable warnings, we have to ensure we test with 500+ records to check if formulas are being delegated and that is a lot of extra work/hassle.

 

 

Hello @PaulD1 

 

I am absolutely sure you know about these methods, but I thought I would post it here anyway for other people who might come accorss this post.

 

Below are two videos dealing with advanced queries to SQL from PowerApps (using Flow). In these examples we send a string array to Flow and then break this up into a querable format for SQL to do its thing with 😉

 
For SQL Azure you can use direct (native) queries:
https://youtu.be/DII10gK715I

 

For on-premesis SQL servers, native queries are not supported from Flow (you will get an error: operation Execute Native Sql is currently not supported using an on-prem gateway connection), so we have to use stored procedures to accomplish the same:
https://youtu.be/BAGBzI4zdww

 

Dawid van Heerden
Follow on Twitter: @davestechtips
Subscribe to YouTube: https://www.youtube.com/davestechtips?sub_confirmation=1
**If you found this reply helpful, please mark this as the answer to close the topic and make it easier to find for other people with similar questions.

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