Skip to content

Update scalar UDF inlining requirements in documentation #10337

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
simonsabin wants to merge 3 commits into from
Closed

Update scalar UDF inlining requirements in documentation #10337

Changes from 2 commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
2e0af49
Update scalar UDF inlining requirements in documentation
simonsabin May 22, 2026
705a24f
Clarify rules for using scalar UDFs in queries
simonsabin May 22, 2026
efc0b15
Potential fix for pull request finding
simonsabin May 22, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 2 additions & 1 deletion docs/t-sql/statements/create-function-sql-data-warehouse.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,8 @@ monikerRange: ">=aps-pdw-2016 || =azure-sqldw-latest || =fabric"
> Scalar UDFs are a preview feature in Fabric Data Warehouse.

> [!IMPORTANT]
> In Fabric Data Warehouse, [scalar UDFs must be inlineable](#scalar-udf-inlining) for use with `SELECT ... FROM` queries on user tables, but you can still create functions that aren't inlineable. Scalar UDFs that are not inlineable work in limited number of scenarios. You can check [whether a UDF can be inlined](#check-whether-a-scalar-udf-can-be-inlined).
> In Fabric Data Warehouse, to use a scalar udf in a query both the function and its use must follow the [rules to allow inlining](../../relational-databases/user-defined-functions/scalar-udf-inlining.md#inlineable-scalar-udf-requirements) otherwise you will get an error `Scalar UDF execution is currently unavailable in this context.`.
Scalar UDFs that cannot be inlineable can be used outside of a query. You can check [whether a UDF can be inlined](#check-whether-a-scalar-udf-can-be-inlined).
Comment thread
simonsabin marked this conversation as resolved.
Outdated

A user-defined function is a [!INCLUDE [tsql](../../includes/tsql-md.md)] routine that accepts parameters, performs an action, such as a complex calculation, and returns the result of that action as a value. Scalar functions return a scalar value, such as a number or string. User-defined table-valued functions (TVFs) return a table.

Expand Down