Oracle cli client (sqlplus) has a neat feature, if you put `/[enter]` in the prompt, it re-executes the last SQL.

```sql
:) select 1;
┌─1─┐
│ 1 │
└───┘

:) /
┌─1─┐
│ 1 │
└───┘
```

currently `<up><enter>` pollutes the screen by the SQL text and can contain SQL script, not a single query. Probably echo should be disabled in this case as well.
rows_by_name.erase(it);
        }
    }
    /// Copy rows from src that dst does not contains.
    for (const auto & [id, pos] : rows_by_name)
    {
        if (thread_id_filter_mask.contains(pos))
        {
            conue;
        }
        for (size_t col = 0; col < src.columns(); ++col)
        {
            mutable_columns[col]->insert((*src.getByPosition(col).column)[pos]);
        }
    }
    dst.setColumns(std::move(mutable_columns));
}
std::atomic_flag exit_on_signal;
class QueryInterruptHandler : private boost::noncopyable
{
public:
    static void start() { exit_on_signal.clear(); }
    /// Return true if the query was stopped.
    static bool stop() { return exit_on_signal.test_and_set(); }
    static bool cancelled() { return exit_on_signal.test(); }
};
/// This signal handler is set only for SIGINT.
void interruptSignalHandler(int signum)
{
    if (QueryInterruptHandler::stop())