**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))



{
    size_t next_step_i = 0;
    if (hasPrewhere())
    {
        const ExpressionActionsChain::Step & step = *chain.steps.at(next_step_i++);
        prewhere_info->prewhere_actions->projectInput(false);
        NameSet columns_to_remove;
        for (const auto & [name, can_remove] : step.required_output)
        {
            if (name == prewhere_info->prewhere_column_name)
                prewhere_info->remove_prewhere_column = can_remove;
            else if (can_remove)
                columns_to_remove.insert(name);
        }
        columns_to_remove_after_prewhere = std::move(columns_to_remove);
    }
    if (hasWhere())
    {
        where_column_name = query.where()->getColumnName();
        remove_where_filter = chain.steps.at(where_step_num)->required_output.find(where_column_name)->second;
    }
}
void ExpressionAnalysisResult::removeExtraColumns() const
{
    if (hasWhere())
        before_where->projectInput();
    if (hasHaving())
        before_having->projectInput();
}
void ExpressionAnalysisResult::checkActions() const