Looks like https://github.com/ClickHouse/ClickHouse/pull/21303 is broke also "clear column" for such columns.

How to reproduce:

```
CREATE TABLE test.TTAdmLog
(
    `ts` DateTime,
    `event_date` Date DEFAULT toDate(ts),
    `impression_id` String DEFAULT '',
    `creative_id` String DEFAULT '',
    `creative_adm` String DEFAULT '',
    `impression_id_compressed` FixedString(16) DEFAULT UUIDStringToNum(impression_id),
    `impression_id_hashed` UInt16 DEFAULT reinterpretAsUInt16(impression_id_compressed),
)
ENGINE = ReplicatedMergeTree('/clickhouse/tables/{shard}/TTAdmLogTest', '{replica}')
PARTITION BY toMonday(event_date)
ORDER BY (event_date, impression_id_hashed)
SAMPLE BY impression_id_hashed
SETTINGS replicated_deduplication_window = 1000, replicated_deduplication_window_seconds = 864000, index_granularity = 8192

CREATE MATERIALIZED VIEW test.TTView
(
    `event_date` Date,
    `creative_id` String,
    `creative_adm` AggregateFunction(anyLast, String),
)
ENGINE = ReplicatedAggregatingMergeTree('/clickhouse/tables/{shard}/TTViewTest', '{replica}', event_date, (event_date, creative_id), 8192) AS
SELECT 
    toStartOfMonth(event_date) AS event_date,
    arrayJoin(splitByChar(',', creative_id)) AS creative_id,
    anyLastState(creative_adm) AS creative_adm,
FROM test.TTAdmLog
GROUP BY 
    event_date,
    creative_id,

```


ClickHouse server version 20.9.3 revision 54439.

```
alter table test.TTAdmLog clear column creative_adm in partition '2021-03-22'

OK

```
ClickHouse server version 21.4.3 revision 54447.

```
alter table test.TTAdmLog  clear column creative_adm in partition '2021-03-22'

DB::Exception: Trying to ALTER DROP column creative_adm which is referenced by materialized view ['TTView'].

```

buffers_plan.addStep(std::move(read_from_buffers));
    }
    if (!query_plan.isInitialized())
    {
        query_plan = std::move(buffers_plan);
        return;
    }
    auto result_header = buffers_plan.getCurrentDataStream().header;
    
    if (!blocksHaveEqualStructure(query_plan.getCurrentDataStream().header, result_header))
    {
        auto convert_actions_dag = ActionsDAG::makeConvertingActions(
                query_plan.getCurrentDataStream().header.getColumnsWithTypeAndName(),
                result_header.getColumnsWithTypeAndName(),
                ActionsDAG::MatchColumnsMode::Name);
        auto converting = std::make_unique<ExpressionStep>(query_plan.getCurrentDataStream(), convert_actions_dag);
        query_plan.addStep(std::move(converting));
    }
    DataStreams input_streams;
    input_streams.emplace_back(query_plan.getCurrentDataStream());
    input_streams.emplace_back(buffers_plan.getCurrentDataStream());
    std::vector<std::unique_ptr<QueryPlan>> plans;
    plans.emplace_back(std::make_unique<QueryPlan>(std::move(query_plan)));
    plans.emplace_back(std::make_unique<QueryPlan>(std::move(buffers_plan)));
    query_plan = QueryPlan();
    auto union_step = std::make_unique<UnionStep>(std::move(input_streams));
    union_step->setStepDescription("Unite sources from Buffer table");
    query_plan.unitePlans(std::move(union_step), std::move(plans));
}
static void appendBlock(const Block & from, Block & to)