```sql
create table dat (blockNum Decimal(10,0), eventTimestamp DateTime64(9) ) 
Engine=MergeTree() primary key eventTimestamp;
insert into dat values (1, '2022-01-24 02:30:00.008122000');

CREATE DICTIONARY datDictionary
(
    `blockNum` Decimal(10, 0),
    `eventTimestamp` DateTime64(9)
)
PRIMARY KEY blockNum
SOURCE(CLICKHOUSE(TABLE 'dat'))
LIFETIME(MIN 0 MAX 1000)
LAYOUT(FLAT());

select * from datDictionary;
┌─blockNum─┬────────────────eventTimestamp─┐
│        1 │ 2022-01-24 02:30:00.008122000 │
└──────────┴───────────────────────────────┘

select count(*) from dat where eventTimestamp >= (select eventTimestamp from datDictionary);

Exception on client:
Code: 32. DB::Exception: Attempt to read after eof: while receiving packet from localhost:9000. (ATTEMPT_TO_READ_AFTER_EOF)

Connecting to localhost:9000 as user default.
Code: 210. DB::NetException: Connection refused (localhost:9000). (NETWORK_ERROR)
```

```sql
drop dictionary datDictionary;

CREATE DICTIONARY datDictionary
(
    `blockNum` Decimal(10, 0),
    `eventTimestamp` DateTime64(9)
)
PRIMARY KEY blockNum
SOURCE(CLICKHOUSE(TABLE 'dat'))
LIFETIME(MIN 0 MAX 1000)
LAYOUT(complex_key_hashed());

select count(*) from dat where eventTimestamp >= (select eventTimestamp from datDictionary);

Error on processing query: Code: 32. DB::Exception: Attempt to read after eof: while receiving packet from localhost:9000. (ATTEMPT_TO_READ_AFTER_EOF) (version 22.7.1.1054)

Connecting to localhost:9000 as user default.
Code: 210. DB::NetException: Connection refused (localhost:9000). (NETWORK_ERROR)
```

```sql
select * from datDictionary;
┌─blockNum─┬────────────────eventTimestamp─┐
│        1 │ 2022-01-24 02:30:00.008122000 │
└──────────┴───────────────────────────────┘

select dictGet('datDictionary', 'eventTimestamp', tuple(cast('1','Decimal(10,0)')));
Code: 407. DB::Exception: Received from localhost:9000. DB::Exception: Bad scale of decimal field. (DECIMAL_OVERFLOW)
```

{
    bool all_numbers = true;
    size_t max_bits_of_signed_integer = 0;
    size_t max_bits_of_unsigned_integer = 0;
    size_t max_mantissa_bits_of_floating = 0;
    auto maximize = [](size_t & what, size_t value)
    {
        if (value > what)
            what = value;
    };
    for (const auto & type : types)
    {
        if (type == TypeIndex::UInt8)
            maximize(max_bits_of_unsigned_integer, 8);
        else if (type == TypeIndex::UInt16)
            maximize(max_bits_of_unsigned_integer, 16);
        else if (type == TypeIndex::UInt32)
            maximize(max_bits_of_unsigned_integer, 32);
        else if (type == TypeIndex::UInt64)
            maximize(max_bits_of_unsigned_integer, 64);
        else if (type == TypeIndex::UInt128)
            maximize(max_bits_of_unsigned_integer, 128);
        else if (type == TypeIndex::UInt256)
            maximize(max_bits_of_unsigned_integer, 256);
        else if (type == TypeIndex::Int8 || type == TypeIndex::Enum8)
            maximize(max_bits_of_signed_integer, 8);
        else if (type == TypeIndex::Int16 || type == TypeIndex::Enum16)
            maximize(max_bits_of_signed_integer, 16);
        else if (type == TypeIndex::Int32)
            maximize(max_bits_of_signed_integer, 32);