Function isDDLQuery

src/Interpreters/executeQuery.cpp:2253–2280

}

bool isDDLQuery( [[maybe_unused]] const ContextPtr & context, const ASTPtr & query)
{
    auto * alter = query->as<ASTAlterQuery>();
    if (alter)
    {
        auto * command_list = alter->command_list;
        /// ATTACH PARTS FROM `dir` and ATTACH DETACHED PARTITION can be considered as DML
        if (command_list && command_list->children.size() == 1
            && (command_list->children[0]->as<ASTAlterCommand>()->attach_from_detached || command_list->children[0]->as<ASTAlterCommand>()->parts))
            return false;

        /// DROP PARTITION and DROP PARTITION WHERE without DETACH can be considered as DML
        if (command_list && command_list->children.size() == 1
            && ((command_list->children[0]->as<ASTAlterCommand>()->type == ASTAlterCommand::Type::DROP_PARTITION
                 || command_list->children[0]->as<ASTAlterCommand>()->type == ASTAlterCommand::Type::DROP_PARTITION_WHERE)
                && !command_list->children[0]->as<ASTAlterCommand>()->detach))
            return false;

        /// All other ATTACH considered DDL
        return true;
    }

    auto * create = query->as<ASTCreateQuery>();
    auto * drop = query->as<ASTDropQuery>();
    auto * rename = query->as<ASTRenameQuery>();

    return create || (drop && drop->kind != ASTDropQuery::Kind::Truncate) || rename;
}

bool isAsyncMode(ContextMutablePtr context)
{