**How to reproduce**

CH version: `20.5.2 revision 54435` (latest on `apt` at the moment). Cannot reproduce on `20.4.5`, so it's a regression.

Table:

```sql
create table repro_hits (
    date Date,
    metric Float64
) engine=MergeTree() order by date
```

Query:

```sql
SELECT
    date as period,
    1 as having_check,
    min(date) as period_start,
    addDays(max(date), 1) as period_end,
    dateDiff('second', period_start, period_end) as total_duration,
    sum(metric) as metric_
FROM repro_hits
GROUP BY period
having having_check != -1
```

**Error message and/or stacktrace**
```
Received exception from server (version 20.5.2):
Code: 179. DB::Exception: Received from localhost:9000. DB::Exception: Different expressions with the same alias period_start:
min(date) AS period_start
and
date AS period_start
.
```

The error goes away if I opt out of optimization with `SETTINGS enable_optimize_predicate_expression = 0`.
if (settings.optimize_aggregators_of_group_by_keys)
        optimizeAggregateFunctionsOfGroupByKeys(select_query);
    
    optimizeDuplicatesInOrderBy(select_query);
    
    if (settings.optimize_duplicate_order_by_and_distinct)
    {
        optimizeDuplicateOrderBy(query, context);
        
        
        if (!settings.distributed_group_by_no_merge)
            optimizeDuplicateDistinct(*select_query);
    }
    
    if (settings.optimize_redundant_functions_in_order_by)
        optimizeRedundantFunctionsInOrderBy(select_query, context);
    
    if (settings.optimize_monotonous_functions_in_order_by)
        optimizeMonotonousFunctionsInOrderBy(select_query, context, tables_with_columns);
    
    if (settings.optimize_if_transform_strings_to_enum)
        transformIfStringsIntoEnum(query);
    
    optimizeLimitBy(select_query);
    
    optimizeUsing(select_query);
}
}