**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))



{
    ExpressionActionsChain::Step & step = chain.lastStep(columns_after_array_join);
    getRootActions(analyzedJoin().leftKeysList(), only_types, step.actions());
    return true;
}
JoinPtr SelectQueryExpressionAnalyzer::appendJoin(ExpressionActionsChain & chain, ActionsDAGPtr & converting_join_columns)
{
    const ColumnsWithTypeAndName & left_sample_columns = chain.getLastStep().getResultColumns();
    JoinPtr table_join = makeTableJoin(*syntax->ast_join, left_sample_columns, converting_join_columns);
    if (converting_join_columns)
    {
        chain.steps.push_back(std::make_unique<ExpressionActionsChain::ExpressionActionsStep>(converting_join_columns));
        chain.addStep();
    }
    ExpressionActionsChain::Step & step = chain.lastStep(columns_after_array_join);
    chain.steps.push_back(std::make_unique<ExpressionActionsChain::JoinStep>(
        syntax->analyzed_join, table_join, step.getResultColumns()));
    chain.addStep();
    return table_join;
}
static ActionsDAGPtr createJoinedBlockActions(ContextPtr context, const TableJoin & analyzed_join)
{
    ASTPtr expression_list = analyzed_join.rightKeysList();
    auto syntax_result = TreeRewriter(context).analyze(expression_list, analyzed_join.columnsFromJoinedTable());
    return ExpressionAnalyzer(expression_list, syntax_result, context).getActionsDAG(true, false);
}
static std::shared_ptr<IJoin> chooseJoinAlgorithm(std::shared_ptr<TableJoin> analyzed_join, const Block & sample_block, ContextPtr context)