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.
const char * next_query_begin = after_query_iterator->begin;
    // We include the ere line if the next query starts after
    // it. This is a generic case of trailing in-line comment.
    // The "equals" condition is for case of end of input (they both equal
    // all_queries_end);
    if (newline )
    {
        assert(newline >= this_query_end);
        this_query_end = newline;
    }
    else
    {
        // Many queries on one line, can't do anything. By the way, this
        // syntax is probably going to work as expected:
        // select nonexistent /* { serverError 12345 } */; select 1
    }
}
/// Convert external tables to ExternalTableData and send them using the connection.
void ClientBase::sendExternalTables(ASTPtr parsed_query)
{
    const auto * select = parsed_query->as<ASTSelectWithUnionQuery>();
    if (!select && !external_tables.empty())
        throw Exception("External tables could be sent only with select query", ErrorCodes::BAD_ARGUMENTS);
    std::vector<ExternalTableDataPtr> data;
    for (auto & table : external_tables)
        data.emplace_back(table.getData(global_context));
    if (send_external_tables)
        connection->sendExternalTablesData(data);
}
void ClientBase::onData(Block & block, ASTPtr parsed_query)