Method getInitialCreateTableQuery

programs/local/LocalServer.cpp:923–972

std::pair<std::string, std::string> LocalServer::getInitialCreateTableQuery()
{
    /// The input data can be specified explicitly with any of the `file`, `structure`, `input-format` command line arguments,
    /// or it can be implicitly specified in stdin - then the structure and format is autodetected.
    /// But if queries were not specified in the command line, they might me in stdin, and this means that stdin is not input data.

    if (!getClientConfiguration().has("table-structure")
        && !getClientConfiguration().has("table-file")
        && !getClientConfiguration().has("table-data-format")
        && (queries.empty() || !isFileDescriptorSuitableForInput(stdin_fd))) /// In we know that there is data in stdin, we can auto-detect the format.
        return {};

    auto table_name = getClientConfiguration().getString("table-name", "table");
    auto table_structure = getClientConfiguration().getString("table-structure", "auto");

    String table_file;
    String compression = "auto";
    if (!getClientConfiguration().has("table-file") || getClientConfiguration().getString("table-file") == "-")
    {
        /// Use Unix tools stdin naming convention
        table_file = "stdin";
        if (default_input_compression_method != CompressionMethod::None)
            compression = toContentEncodingName(default_input_compression_method);
    }
    else
    {
        /// Use regular file
        auto file_name = getClientConfiguration().getString("table-file");
        table_file = quoteString(file_name);
    }

    String data_format;

    if (default_input_format == "auto" && getClientConfiguration().has("table-structure"))
        data_format = "TabSeparated";   /// Compatibility with older versions when format inference was not available.
    else
        data_format = backQuoteIfNeed(default_input_format);

    if (table_structure == "auto")
        table_structure = "";
    else
        table_structure = "(" + table_structure + ")";

    return
    {
        table_name,
        fmt::format("CREATE TEMPORARY TABLE {} {} ENGINE = File({}, {}, {});",
            backQuote(table_name), table_structure, data_format, table_file, compression)
    };
}


namespace