execute method
Implementation
Future<MutationResult> execute(String sql,
[List<Object?> parameters = const []]) async {
final result = await _request('execute', [sql, parameters]) as List;
return MutationResult(
result[0] as int,
result[1] as BigInt?,
result[2] == null
? null
: QueryResult(
List<String>.from((result[2] as List)[0] as List),
((result[2] as List)[1] as List)
.map((row) => List<Object?>.from(row as List))
.toList()));
}