Function getSubqueryContext

src/Interpreters/InterpreterSelectQuery.cpp:391–402

There are no limits on the maximum size of the result for the subquery. * Since the result of the query is not the result of the entire query. */

  *  Since the result of the query is not the result of the entire query.
  */
ContextPtr getSubqueryContext(const ContextPtr & context)
{
    auto subquery_context = Context::createCopy(context);
    Settings subquery_settings = context->getSettingsCopy();
    subquery_settings[Setting::max_result_rows] = 0;
    subquery_settings[Setting::max_result_bytes] = 0;
    subquery_settings[Setting::implicit_table_at_top_level] = "";
    /// The calculation of extremes does not make sense and is not necessary (if you do it, then the extremes of the subquery can be taken for whole query).
    subquery_settings[Setting::extremes] = false;
    subquery_context->setSettings(subquery_settings);
    return subquery_context;
}

void rewriteMultipleJoins(ASTPtr & query, const TablesWithColumns & tables, const String & database, const Settings & settings)
{