Add test

Author: Giorgi

DuckDB.NET.Test/TableFunctionTests.cs

@@ -5,6 +5,8 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using System.Numerics;
+using DuckDB.NET.Native;
 using Xunit;
 
 namespace DuckDB.NET.Test;
@@ -100,9 +102,9 @@ public void RegisterTableFunctionWithFourParameters()
             var param2 = parameters[1].GetValue<decimal>();
             var param3 = parameters[2].GetValue<byte>();
             var param4 = parameters[3].GetValue<Guid>();
-            
+
             var enumerable = param4.ToByteArray(param1).Append(param3);
-            
+
             return new TableFunction(new List<ColumnInfo>()
             {
                 new ColumnInfo("foo", typeof(byte)),
@@ -148,4 +150,28 @@ public void RegisterTableFunctionWithEmptyResult()
 
         data.Should().BeEquivalentTo(Enumerable.Empty<int>());
     }
+
+    [Fact]
+    public void RegisterTableFunctionWithBigInteger()
+    {
+        Connection.RegisterTableFunction<BigInteger, TimeSpan>("demo6", parameters =>
+        {
+            var param1 = parameters[0].GetValue<BigInteger>();
+            var param2 = parameters[1].GetValue<TimeSpan>();
+
+            var timeSpans = param1.ToByteArray().Select(b => param2.Add(TimeSpan.FromDays(b)));
+
+            return new TableFunction(new List<ColumnInfo>()
+            {
+                new ColumnInfo("foo", typeof(TimeSpan)),
+            }, timeSpans);
+        }, (item, writers, rowIndex) =>
+        {
+            writers[0].WriteValue((TimeSpan)item, rowIndex);
+        });
+
+        var data = Connection.Query<TimeSpan>("SELECT * FROM demo6('123456789876543210'::HUGEINT, '24:00:00'::INTERVAL);").ToList();
+
+        data.Should().BeEquivalentTo(BigInteger.Parse("123456789876543210").ToByteArray().Select(b => TimeSpan.FromDays(1 + b)));
+    }
 }