**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 (analyzed_join->tryInitDictJoin(sample_block, context))
        return std::make_shared<HashJoin>(analyzed_join, sample_block);
    bool allow_merge_join = analyzed_join->allowMergeJoin();
    if (analyzed_join->forceHashJoin() || (analyzed_join->preferMergeJoin() && !allow_merge_join))
        return std::make_shared<HashJoin>(analyzed_join, sample_block);
    else if (analyzed_join->forceMergeJoin() || (analyzed_join->preferMergeJoin() && allow_merge_join))
        return std::make_shared<MergeJoin>(analyzed_join, sample_block);
    return std::make_shared<JoinSwitcher>(analyzed_join, sample_block);
}
static std::unique_ptr<QueryPlan> buildJoinedPlan(
    ContextPtr context,
    const ASTTablesInSelectQueryElement & join_element,
    TableJoin & analyzed_join,
    SelectQueryOptions query_options)
{
    
    auto joined_block_actions = createJoinedBlockActions(context, analyzed_join);
    Names original_right_columns;
    NamesWithAliases required_columns_with_aliases = analyzed_join.getRequiredColumns(
        Block(joined_block_actions->getResultColumns()), joined_block_actions->getRequiredColumns().getNames());
    for (auto & pr : required_columns_with_aliases)
        original_right_columns.push_back(pr.first);
    /** For GLOBAL JOINs (in the case, for example, of the push method for executing GLOBAL subqueries), the following occurs