```
milovidov-desktop :) CREATE DICTIONARY dict
:-] (
:-]     k1 UInt64,
:-]     k2 UInt8,
:-]     value String
:-] )
:-] PRIMARY KEY k1, k2
:-] SOURCE(CLICKHOUSE(HOST 'localhost' PORT 9000 USER 'default' TABLE 'dict'))
:-] LIFETIME(1000)
:-] LAYOUT(COMPLEX_KEY_HASHED());

CREATE DICTIONARY dict
(
    `k1` UInt64,
    `k2` UInt8,
    `value` String
)
PRIMARY KEY k1, k2
SOURCE(CLICKHOUSE(HOST 'localhost' PORT 9000 USER 'default' TABLE 'dict'))
LIFETIME(MIN 0 MAX 1000)
LAYOUT(COMPLEX_KEY_HASHED())

Ok.

0 rows in set. Elapsed: 0.001 sec. 

milovidov-desktop :) SELECT dictGetString('default.dict', 'third_column', (1, 2, 3, 4, 5, 6, 7, 8, 9, 10));

SELECT dictGetString('default.dict', 'third_column', (1, 2, 3, 4, 5, 6, 7, 8, 9, 10))
```
#pragma once
#include <memory>
#include <Poco/Logger.h>
#include <Client/ConnectionPoolWithFailover.h>
#include <Interpreters/Context.h>
#include "DictionaryStructure.h"
#include "ExternalQueryBuilder.h"
#include "IDictionarySource.h"
namespace DB
{
/** Allows loading dictionaries from local or remote ClickHouse instance
  *    @todo use ConnectionPoolWithFailover
  *    @todo invent a way to keep track of source modifications
  */
class ClickHouseDictionarySource final : public IDictionarySource