Method executeMultiQuery

src/Client/ClientBase.cpp:2872–3198

bool ClientBase::executeMultiQuery(const String & all_queries_text)
{
    bool echo_query = echo_queries;

    {
        /// disable logs if expects errors
        TestHint test_hint(all_queries_text);
        if (test_hint.hasClientErrors() || test_hint.hasServerErrors())
        {
            auto u = processTextAsSingleQuery("SET send_logs_level = 'fatal'");
            UNUSED(u);
        }
    }

    /// Test tags are started with "--" so they are interpreted as comments anyway.
    /// But if the echo is enabled we have to remove the test tags from `all_queries_text`
    /// because we don't want test tags to be echoed.
    size_t test_tags_length = getTestTagsLength(all_queries_text);

    /// Several queries separated by ';'.
    /// INSERT data is ended by the empty line (\n\n), not ';'.
    /// Unnecessary semicolons may cause data to be parsed containing ';'
    /// e.g. 'insert into xx format csv val;' will insert "val;" instead of "val"
    ///      'insert into xx format csv val\n;' will insert "val" and ";"
    /// An exception is VALUES format where we also support semicolon in
    /// addition to end of line.
    const char * this_query_begin = all_queries_text.data() + test_tags_length;
    const char * this_query_end = nullptr;
    const char * all_queries_end = all_queries_text.data() + all_queries_text.size();

    const char * prev_query_begin = all_queries_text.data();
    UInt32 script_query_number = 0;
    UInt32 script_line_number = 0;

    ASTPtr parsed_query;
    std::unique_ptr<Exception> current_exception;
    size_t retries_count = 0;
    bool is_first = true;

    while (true)
    {
        auto stage = analyzeMultiQueryText(this_query_begin, this_query_end, all_queries_end,
                                           parsed_query, current_exception);
        switch (stage)
        {
            case MultiQueryProcessingStage::QUERIES_END:
            {
                /// Compatible with old version when run interactive, e.g. "", "\ld"
                if (is_first && is_interactive)
                {
                    auto u = processTextAsSingleQuery(all_queries_text);
                    UNUSED(u);
                }
                return true;
            }
            case MultiQueryProcessingStage::PARSING_FAILED:
            {
                have_error |= buzz_house;