**Describe what's wrong**

Query with rollup using same selected field name as the name of underlying column reports structure mismatch

**Does it reproduce on recent release?**

yes

**How to reproduce**

`21.9.2.17`

```sql
CREATE TABLE test
(
    `d` DateTime,
    `a` LowCardinality(String),
    `b` UInt64
)
ENGINE = MergeTree
PARTITION BY toDate(d)
ORDER BY d;

SELECT *
FROM (
    SELECT
        a,
        max((d, b)).2 AS value
    FROM test
    GROUP BY rollup(a)
)
WHERE a <> '';
```

**Expected behavior**

This used to return an ok result on v21.8

**Error message and/or stacktrace**

> Code: 352. DB::Exception: Block structure mismatch in (columns with identical name must have identical structure) stream: different columns:
> notEquals(a, '') LowCardinality(UInt8) ColumnLowCardinality(size = 0, UInt8(size = 0), ColumnUnique(size = 1, UInt8(size = 1)))
> notEquals(a, '') LowCardinality(UInt8) Const(size = 0, ColumnLowCardinality(size = 1, UInt8(size = 1), ColumnUnique(size = 2, UInt8(size = 2)))). (AMBIGUOUS_COLUMN_NAME) (version 21.9.2.17 (official build))



if (!options.ignore_limits)
        {
            limits = getLimitsForStorage(settings, options);
            leaf_limits = SizeLimits(settings.max_rows_to_read_leaf, settings.max_bytes_to_read_leaf, settings.read_overflow_mode_leaf);
        }
        if (!options.ignore_quota && (options.to_stage == QueryProcessingStage::Complete))
            quota = context->getQuota();
        storage->read(query_plan, required_columns, metadata_snapshot, query_info, context, processing_stage, max_block_size, max_streams);
        if (context->hasQueryContext() && !options.is_internal)
        {
            const String view_name{};
            auto local_storage_id = storage->getStorageID();
            context->getQueryContext()->addQueryAccessInfo(
                backQuoteIfNeed(local_storage_id.getDatabaseName()),
                local_storage_id.getFullTableName(),
                required_columns,
                query_info.projection ? query_info.projection->desc->name : "",
                view_name);
        }
        
        if (!query_plan.isInitialized())
        {
            auto header = query_info.projection
                ? query_info.projection->desc->metadata->getSampleBlockForColumns(
                    query_info.projection->required_columns, storage->getVirtuals(), storage->getStorageID())
                : metadata_snapshot->getSampleBlockForColumns(required_columns, storage->getVirtuals(), storage->getStorageID());
            addEmptySourceToQueryPlan(query_plan, header, query_info, context);
        }
        
        auto adding_limits_and_quota = std::make_unique<SettingQuotaAndLimitsStep>(