**Use case**

Like `date_time_input_format = 'best_effort'` but with disambiguation to American mm/dd/yyyy style.

#include <Core/SettingsEnums.h>
namespace DB
{
namespace ErrorCodes
{
    extern const int UNKNOWN_LOAD_BALANCING;
    extern const int UNKNOWN_OVERFLOW_MODE;
    extern const int UNKNOWN_TOTALS_MODE;
    extern const int UNKNOWN_DISTRIBUTED_PRODUCT_MODE;
    extern const int UNKNOWN_JOIN;
    extern const int BAD_ARGUMENTS;
    extern const int UNKNOWN_MYSQL_DATATYPES_SUPPORT_LEVEL;
    extern const int UNKNOWN_UNION;
}
IMPLEMENT_SETTING_ENUM(LoadBalancing, ErrorCodes::UNKNOWN_LOAD_BALANCING,
    {{"random",           LoadBalancing::RANDOM},
     {"nearest_hostname", LoadBalancing::NEAREST_HOSTNAME},
     {"in_order",         LoadBalancing::IN_ORDER},
     {"first_or_random",  LoadBalancing::FIRST_OR_RANDOM},
     {"round_robin",      LoadBalancing::ROUND_ROBIN}})
IMPLEMENT_SETTING_ENUM(JoinStrictness, ErrorCodes::UNKNOWN_JOIN,
    {{"",    JoinStrictness::Unspecified},
     {"ALL", JoinStrictness::ALL},
     {"ANY", JoinStrictness::ANY}})
IMPLEMENT_SETTING_ENUM(JoinAlgorithm, ErrorCodes::UNKNOWN_JOIN,
    {{"auto",                 JoinAlgorithm::AUTO},