22734550158

Committed 05 Mar 2026 08:06PM UTC coverage: 89.491%. Remained the same

Build # 22734550158

Build Type

push

github

Committed by

Giorgi

Commit Message

Add NULL handling support for scalar functions

Replace `isPureFunction` bool with `ScalarFunctionOptions`
record that supports `IsPureFunction` and `HandlesNulls`.

- Add `ScalarFunctionOptions` with `IsPureFunction` and
  `HandlesNulls` properties
- Bind `duckdb_scalar_function_set_special_handling` native
  method to enable NULL passthrough
- Update simplified scalar function extensions to validate
  nullable parameter types when `HandlesNulls` is true
- Propagate NULL correctly: nullable types get default,
  non-nullable types throw with a clear error message
- Update existing tests to use new options API

Coverage Stats

1287 of 1499 branches covered (85.86%)

Branch coverage included in aggregate %.

41 of 49 new or added lines in 3 files covered. (83.67%)

2 existing lines in 2 files now uncovered.

2630 of 2878 relevant lines covered (91.38%)

446353.59 hits per line

Source File
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66.67

/DuckDB.NET.Data/ScalarFunctionOptions.cs

1	namespace DuckDB.NET.Data;
2
NEW 3	public record ScalarFunctionOptions	×
4	{
5	/// <summary>
6	/// Whether the function is pure (deterministic). When null, defaults to
7	/// true for functions with parameters and false for parameterless functions.
8	/// </summary>
9	public bool? IsPureFunction { get; init; }	36✔
10
11	/// <summary>
12	/// When true, the function receives NULL inputs and handles them itself.
13	/// When false (default), DuckDB auto-propagates NULL without calling the function.
14	/// </summary>
15	public bool HandlesNulls { get; init; }	87✔
16	}

Giorgi / DuckDB.NET / 22734550158

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