Method getImpl

src/DataTypes/DataTypeFactory.cpp:120–150

template <bool nullptr_on_error>
DataTypePtr DataTypeFactory::getImpl(const String & full_name) const
{
    /// Data type parser can be invoked from coroutines with small stack.
    /// Value 315 is known to cause stack overflow in some test configurations (debug build, sanitizers)
    /// let's make the threshold significantly lower.
    /// It is impractical for user to have complex data types with this depth.

#if defined(SANITIZER) || !defined(NDEBUG)
    static constexpr size_t data_type_max_parse_depth = 150;
#else
    static constexpr size_t data_type_max_parse_depth = 300;
#endif

    ParserDataType parser;
    ASTPtr ast;
    if constexpr (nullptr_on_error)
    {
        String out_err;
        const char * start = full_name.data();
        ast = tryParseQuery(parser, start, start + full_name.size(), out_err, false, "data type", false,
            DBMS_DEFAULT_MAX_QUERY_SIZE, data_type_max_parse_depth, DBMS_DEFAULT_MAX_PARSER_BACKTRACKS, true);
        if (!ast)
            return nullptr;
    }
    else
    {
        ast = parseQuery(parser, full_name.data(), full_name.data() + full_name.size(), "data type", false, data_type_max_parse_depth, DBMS_DEFAULT_MAX_PARSER_BACKTRACKS);
    }

    return getImpl<nullptr_on_error>(ast);
}

DataTypePtr DataTypeFactory::get(const ASTPtr & ast) const
{