Reduce Columns Created in a Collection in Canvas Apps

One of the first lessons when getting to grips with Canvas Apps was that you should always use Collections where possible to reduce the number of calls to the original data source, and with any luck, you may see a performance increase as a result too. However, I often find that the data source I’m using always collects a number of columns that I am never going to use in the Canvas App itself.

Let’s take the example of listing Account records from Dataverse using a simple Power Fx statement:

ClearCollect(ListOfAccounts, Accounts);

As you can see below, there are a significant number of columns that I don’t plan to use relating to various relationships across the Dataverse database.

A screenshot showing a Collection in Canvas Apps returning all fields from the data source.

These columns are extremely important for the database and we shouldn’t underestimate their criticality, but these are not necessarily important for me when building a Canvas App as I just want to retrieve the Account Name and the Account ID.

We can make a small change to the original Power Fx statement, by expressing exactly which columns to use, such as:

ClearCollect(ListOfAccounts, ShowColumns(Accounts, "name", "accountid"));

Which in turn produces a Collection that is much more refined, shown below.

A screenshot showing a Collection in Canvas Apps returning a more defined list of columns based on my needs for the app.
This won’t necessarily make a difference to the code that you write within your app, other than the collection’s size itself, however, when you start to write Power Fx within your components you’ll see a much shorter and more defined list of available attributes when trying to retrieve data from your collection!

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