Merge pull request #265 from joostas/parameterless-scalar-function

Add overload to register parameterless scalar function

Author: Giorgi

DuckDB.NET.Data/DuckDBConnection.ScalarFunction.cs

@@ -15,9 +15,9 @@ partial class DuckDBConnection
 {
 #if NET8_0_OR_GREATER
     [Experimental("DuckDBNET001")]
-    public void RegisterScalarFunction<TResult>(string name, Action<IReadOnlyList<IDuckDBDataReader>, IDuckDBDataWriter, ulong> action, bool isPureFunction = false)
+    public void RegisterScalarFunction<TResult>(string name, Action<IDuckDBDataWriter, ulong> action, bool isPureFunction = false)
     {
-        RegisterScalarMethod(name, action, TypeExtensions.GetLogicalType<TResult>(), varargs: false, !isPureFunction);
+        RegisterScalarMethod(name, (_, w, index) => action(w, index), TypeExtensions.GetLogicalType<TResult>(), varargs: false, !isPureFunction);
     }
 
     [Experimental("DuckDBNET001")]

DuckDB.NET.Test/ScalarFunctionTests.cs

@@ -64,7 +64,7 @@ public void RegisterScalarFunctionWithVarargs()
     public void RegisterScalarFunctionWithoutParameters()
     {
         var values = new List<long>();
-        Connection.RegisterScalarFunction<long>("my_random", (_, writer, rowCount) =>
+        Connection.RegisterScalarFunction<long>("my_random", (writer, rowCount) =>
         {
             for (ulong index = 0; index < rowCount; index++)
             {