**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))



{
    const auto * select_query = getSelectQuery();
    auto [array_join_expression_list, is_array_join_left] = select_query->arrayJoinExpressionList();
    if (!array_join_expression_list)
        return nullptr;
    ExpressionActionsChain::Step & step = chain.lastStep(sourceColumns());
    getRootActions(array_join_expression_list, only_types, step.actions());
    auto array_join = addMultipleArrayJoinAction(step.actions(), is_array_join_left);
    before_array_join = chain.getLastActions();
    chain.steps.push_back(std::make_unique<ExpressionActionsChain::ArrayJoinStep>(
            array_join, step.getResultColumns()));
    chain.addStep();
    return array_join;
}
bool SelectQueryExpressionAnalyzer::appendJoinLeftKeys(ExpressionActionsChain & chain, bool only_types)