remove helper after feedback

appender.go

@@ -205,3 +205,20 @@ func (a *Appender) closeDataChunks() {
 	}
 	a.chunks = a.chunks[:0]
 }
+
+func mallocTypeSlice(count int) (unsafe.Pointer, []C.duckdb_logical_type) {
+	var dummy C.duckdb_logical_type
+	size := C.size_t(unsafe.Sizeof(dummy))
+
+	ptr := unsafe.Pointer(C.malloc(C.size_t(count) * size))
+	slice := (*[1 << 30]C.duckdb_logical_type)(ptr)[:count:count]
+
+	return ptr, slice
+}
+
+func destroyTypeSlice(ptr unsafe.Pointer, slice []C.duckdb_logical_type) {
+	for _, t := range slice {
+		C.duckdb_destroy_logical_type(&t)
+	}
+	C.free(ptr)
+}

vector_setters.go

@@ -11,6 +11,9 @@ import (
 	"unsafe"
 )
 
+// secondsPerDay to calculate the days since 1970-01-01.
+const secondsPerDay = 24 * 60 * 60
+
 // fnSetVectorValue is the setter callback function for any (nested) vector.
 type fnSetVectorValue func(vec *vector, rowIdx C.idx_t, val any)