Function createContextForSubQuery

src/Interpreters/executeSubQuery.cpp:19–38

}

ContextMutablePtr createContextForSubQuery(ContextPtr context, String sub_query_tag)
{
    auto query_context = Context::createCopy(context);
    query_context->makeSessionContext();
    query_context->makeQueryContext();

    auto parent_initial_query_id = context->getInitialQueryId();
    auto uuid = UUIDHelpers::UUIDToString(UUIDHelpers::generateV4());
    String initial_query_id;
    if (sub_query_tag.empty())
        initial_query_id = fmt::format("{}_{}", context->getCurrentQueryId(), uuid);
    else
        initial_query_id = fmt::format("{}_{}_{}", context->getCurrentQueryId(), sub_query_tag, uuid);

    query_context->getClientInfo().parent_initial_query_id = parent_initial_query_id;
    query_context->getClientInfo().initial_query_id = initial_query_id;
    query_context->setCurrentQueryId(initial_query_id);

    return query_context;
}

void modifyQueryContext(ContextMutablePtr query_context, bool internal)
{