Add prototype for new query builder

drift/benchmark/reads.dart

@@ -0,0 +1,33 @@
+import 'package:drift/drift.dart';
+import 'package:drift/native.dart';
+
+part 'reads.g.dart';
+
+class Items extends Table {
+  IntColumn get id => integer().autoIncrement()();
+  TextColumn get content => text()();
+}
+
+@DriftDatabase(tables: [Items])
+final class BenchmarkReadsDatabase extends _$BenchmarkReadsDatabase {
+  BenchmarkReadsDatabase(super.e);
+
+  @override
+  int get schemaVersion => 1;
+}
+
+void main() async {
+  final db = BenchmarkReadsDatabase(NativeDatabase.memory());
+  await db.customStatement('''
+WITH RECURSIVE
+  cnt(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM cnt WHERE x<1000000)
+INSERT INTO items (content) SELECT x FROM cnt;
+''');
+
+  print('has items');
+  final sw = Stopwatch()..start();
+  final items = await db.items.all().get();
+  sw.stop();
+
+  print('Selecting ${items.length}: ${sw.elapsed}');
+}