Update Aug 15 2019 - Microsoft has updated PowerApps to allow for some complex SharePoint data delegation, this will hopefully resolve most issues you were seeing when working with SharePoint data: https://powerapps.microsoft.com/en-us/blog/sharepoint-delegation-improvements/ If you've tried to use the Filter, LookUp or Search actions in PowerApps you have seen the yellow warning error that shows a 'delegation warning' and you might have even ignored it because your PowerApp was working fine in testing. However once you get into larger data sets your PowerApp will have some issues so in this blog I will attempt to explain what the delegation warning is and how you can fix your PowerApp. Delegation So what even is Delegation in PowerApps? When doing any sort of data manipulation for an app, PowerApps will try to push the processing of that data to the source system instead of doing all of the manipulation in the app. This is done to increase the efficiency of you...
Microsoft - O365 - SharePoint Blog