Support reading HugeInt and interval values

Author: Giorgi

DuckDB.NET.Bindings/DuckDBWrapperObjects.cs

@@ -141,15 +141,15 @@ public T GetValue<T>()
             DuckDBType.Decimal => Cast(decimal.Parse(NativeMethods.Value.DuckDBGetVarchar(this))),
             DuckDBType.Uuid => Cast(new Guid(NativeMethods.Value.DuckDBGetVarchar(this))),
 
-            //DuckDBType.HugeInt => expr,
-            //DuckDBType.UnsignedHugeInt => expr,
+            DuckDBType.HugeInt => Cast(NativeMethods.Value.DuckDBGetHugeInt(this).ToBigInteger()),
+            DuckDBType.UnsignedHugeInt => Cast(NativeMethods.Value.DuckDBGetUHugeInt(this).ToBigInteger()),
 
             DuckDBType.Varchar => Cast(NativeMethods.Value.DuckDBGetVarchar(this)),
 
             //DuckDBType.Date => expr,
             //DuckDBType.Time => expr,
             //DuckDBType.TimeTz => expr,
-            //DuckDBType.Interval => expr,
+            DuckDBType.Interval => Cast((TimeSpan)NativeMethods.Value.DuckDBGetInterval(this)),
             DuckDBType.Timestamp => Cast(NativeMethods.DateTimeHelpers.DuckDBFromTimestamp(NativeMethods.Value.DuckDBGetTimestamp(this)).ToDateTime()),
             //DuckDBType.TimestampS => expr,
             //DuckDBType.TimestampMs => expr,
@@ -158,9 +158,6 @@ public T GetValue<T>()
             _ => throw new NotImplementedException($"Cannot read value of type {typeof(T).FullName}")
         };
 
-        T Cast<TSource>(TSource value)
-        {
-            return Unsafe.As<TSource, T>(ref value);
-        }
+        T Cast<TSource>(TSource value) => Unsafe.As<TSource, T>(ref value);
     }
 }

DuckDB.NET.Bindings/NativeMethods/NativeMethods.Value.cs

@@ -111,22 +111,22 @@ public static class Value
         public static extern double DuckDBGetDouble(DuckDBValue value);
 
         [DllImport(DuckDbLibrary, CallingConvention = CallingConvention.Cdecl, EntryPoint = "duckdb_get_date")]
-        public static extern unsafe DuckDBDate DuckDBGetDate(DuckDBValue value);
+        public static extern DuckDBDate DuckDBGetDate(DuckDBValue value);
 
         [DllImport(DuckDbLibrary, CallingConvention = CallingConvention.Cdecl, EntryPoint = "duckdb_get_time")]
-        public static extern unsafe DuckDBTime DuckDBGetTime(DuckDBValue value);
+        public static extern DuckDBTime DuckDBGetTime(DuckDBValue value);
 
         [DllImport(DuckDbLibrary, CallingConvention = CallingConvention.Cdecl, EntryPoint = "duckdb_get_time_tz")] 
-        public static extern unsafe DuckDBTimeTzStruct DuckDBGetTimeTz(DuckDBValue value);
+        public static extern DuckDBTimeTzStruct DuckDBGetTimeTz(DuckDBValue value);
 
         [DllImport(DuckDbLibrary, CallingConvention = CallingConvention.Cdecl, EntryPoint = "duckdb_get_timestamp")]
-        public static extern unsafe DuckDBTimestampStruct DuckDBGetTimestamp(DuckDBValue value);
+        public static extern DuckDBTimestampStruct DuckDBGetTimestamp(DuckDBValue value);
 
         [DllImport(DuckDbLibrary, CallingConvention = CallingConvention.Cdecl, EntryPoint = "duckdb_get_interval")]
-        public static extern unsafe DuckDBInterval DuckDBGetInterval(DuckDBValue value);
+        public static extern DuckDBInterval DuckDBGetInterval(DuckDBValue value);
 
         [DllImport(DuckDbLibrary, CallingConvention =  CallingConvention.Cdecl, EntryPoint = "duckdb_get_value_type")]
-        public static extern unsafe DuckDBLogicalType DuckDBGetValueType(DuckDBValue value);
+        public static extern DuckDBLogicalType DuckDBGetValueType(DuckDBValue value);
 
         [DllImport(DuckDbLibrary, CallingConvention = CallingConvention.Cdecl, EntryPoint = "duckdb_get_varchar")]
         public static extern string DuckDBGetVarchar(DuckDBValue value);