**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))



}
        
        result_header = getSampleBlockImpl();
    };
    analyze(shouldMoveToPrewhere());
    bool need_analyze_again = false;
    if (analysis_result.prewhere_constant_filter_description.always_false || analysis_result.prewhere_constant_filter_description.always_true)
    {
        if (analysis_result.prewhere_constant_filter_description.always_true)
            query.setExpression(ASTSelectQuery::Expression::PREWHERE, {});
        else
            query.setExpression(ASTSelectQuery::Expression::PREWHERE, std::make_shared<ASTLiteral>(0u));
        need_analyze_again = true;
    }
    if (analysis_result.where_constant_filter_description.always_false || analysis_result.where_constant_filter_description.always_true)
    {
        if (analysis_result.where_constant_filter_description.always_true)
            query.setExpression(ASTSelectQuery::Expression::WHERE, {});
        else
            query.setExpression(ASTSelectQuery::Expression::WHERE, std::make_shared<ASTLiteral>(0u));
        need_analyze_again = true;
    }
    if (need_analyze_again)
    {
        LOG_TRACE(log, "Running 'analyze' second time");
        
        subquery_for_sets = std::move(query_analyzer->getSubqueriesForSets());
        prepared_sets = std::move(query_analyzer->getPreparedSets());