**Describe the situation**
multiIf works 10 times slower than If with single condition.

**How to reproduce**
ClickHouse version 21.10

```

SELECT count()
FROM numbers_mt(1000000000)
WHERE NOT ignore(multiIf(number = 0, NULL, toNullable(number)))

┌────count()─┐
│ 1000000000 │
└────────────┘

1 rows in set. Elapsed: 10.267 sec. Processed 1.00 billion rows, 8.00 GB (97.41 million rows/s., 779.25 MB/s.)

SELECT count()
FROM numbers_mt(1000000000)
WHERE NOT ignore(If(number = 0, NULL, toNullable(number)))

┌────count()─┐
│ 1000000000 │
└────────────┘

1 rows in set. Elapsed: 1.010 sec. Processed 1.00 billion rows, 8.00 GB (990.63 million rows/s., 7.93 GB/s.)
```

**Expected performance**
The same performance for multiIf and if.

* The profile can also be set using the `set` functions, like the profile setting.
     */
    void setProfile(const String & profile_name, const Poco::Util::AbstractConfiguration & config);
    /// 
    void loadSettingsFromConfig(const String & path, const Poco::Util::AbstractConfiguration & config);
    /// 
    void dumpToMapColumn(IColumn * column, bool changed_only = true);
    /// 
    /// 
    void addProgramOptions(boost::program_options::options_description & options);
    /// 
    /// 
    /// 
    void addProgramOptionsAsMultitokens(boost::program_options::options_description & options);
    /// 
    /// 
    static void checkNoSettingNamesAtTopLevel(const Poco::Util::AbstractConfiguration & config, const String & config_path);
    std::vector<String> getAllRegisteredNames() const override;
    void addProgramOption(boost::program_options::options_description & options, const SettingFieldRef & field);
    void addProgramOptionAsMultitoken(boost::program_options::options_description & options, const SettingFieldRef & field);
};
/*
 * User-specified file format settings for File and URL engines.
 */
DECLARE_SETTINGS_TRAITS(FormatFactorySettingsTraits, FORMAT_FACTORY_SETTINGS)
struct FormatFactorySettings : public BaseSettings<FormatFactorySettingsTraits>
{
};
}