**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))



{
    auto set_key = PreparedSetKey::forSubquery(*subquery_or_table_name);
    if (prepared_sets.count(set_key))
        return; 
    if (auto set_ptr_from_storage_set = isPlainStorageSetInSubquery(subquery_or_table_name))
    {
        prepared_sets.insert({set_key, set_ptr_from_storage_set});
        return;
    }
    auto interpreter_subquery = interpretSubquery(subquery_or_table_name, getContext(), {}, query_options);
    auto io = interpreter_subquery->execute();
    PullingAsyncPipelineExecutor executor(io.pipeline);
    SetPtr set = std::make_shared<Set>(settings.size_limits_for_set, true, getContext()->getSettingsRef().transform_null_in);
    set->setHeader(executor.getHeader().getColumnsWithTypeAndName());
    Block block;
    while (executor.pull(block))
    {
        if (block.rows() == 0)
            continue;
        
        if (!set->insertFromBlock(block.getColumnsWithTypeAndName()))
            return;
    }
    set->finishInsert();
    prepared_sets[set_key] = std::move(set);
}
SetPtr ExpressionAnalyzer::isPlainStorageSetInSubquery(const ASTPtr & subquery_or_table_name)