I have a table with one million rows of data. And It's schema is like:
```
create table redis_dictionary_test
(
	date String,
	id String,
	value Int64
)
engine = MergeTree()
partition by date
order by id
settings index_granularity = 8192;
```

I also inserted one million key-value pairs into Redis.
The dictionary is like:
```
create dictionary redis_dict
(
	date String,
	id String,
	value Int64
)
PRIMARY KEY date, id
SOURCE(REDIS(
	host '127.0.0.1'
	port 6379
	storage_type 'hash_map'
	db_index 0
))
LAYOUT(COMPLEX_KEY_DIRECT())
```
When I execute this query: `SELECT COUNT(DISTINCT dictGet('redis_dict', 'value', tuple(date, id))) FROM redis_dictionary_test;`, ClickHouse seems stuck. Progress was in this state: 122.88 thousand rows, 5.84 MB (1.20 million rows/s., 56.83 MB/s.)  12% about five minutes. Finally, I canceled query.

I am sure Redis is fine. Because I monitored Redis and it could accept read and write commands.

I also executed this query on 1000, 10000 and 100000 rows of data. They can return data normally.

What happened to ClickHouse? Where can I find out the reason?
{
            SIMPLE,
            HASH_MAP,
            UNKNOWN
    };
    class RedisDictionarySource final : public IDictionarySource
    {
        RedisDictionarySource(
                const DictionaryStructure & dict_struct,
                const std::string & host,
                UInt16 port,
                UInt8 db_index,
                const std::string & password,
                RedisStorageType storage_type,
                const Block & sample_block);
    public:
        using RedisArray = Poco::Redis::Array;
        using RedisCommand = Poco::Redis::Command;
        RedisDictionarySource(
                const DictionaryStructure & dict_struct,
                const Poco::Util::AbstractConfiguration & config,
                const std::string & config_prefix,
                Block & sample_block);
        RedisDictionarySource(const RedisDictionarySource & other);
        ~RedisDictionarySource() override;
        Pipe loadAll() override;
        Pipe loadUpdatedAll() override