```sql
DROP TABLE IF EXISTS tp;

create table tp (d1 Int32, d2 Int32, eventcnt Int64,
projection p (select sum(eventcnt), d1 group by d1)) 
engine = SummingMergeTree order by (d1, d2);

set allow_experimental_projection_optimization = 1, force_optimize_projection = 1;

select sum(eventcnt) eventcnt, d1
from tp
group by d1;

DB::Exception: No projection is used when allow_experimental_projection_optimization = 1.

```

The exception message is also incorrect, should be "when force_optimize_projection = 1".

const SelectQueryInfo & query_info,
    const Names & virt_columns,
    const Settings & settings,
    const MergeTreeReaderSettings & reader_settings,
    ActionsDAGPtr & out_projection,
    const String & query_id) const
{
    const auto data_settings = data.getSettings();
    size_t sum_marks = 0;
    size_t adaptive_parts = 0;
    for (const auto & part : parts)
    {
        for (const auto & range : part.ranges)
            sum_marks += range.end - range.begin;
        if (part.data_part->index_granularity_info.is_adaptive)
            ++adaptive_parts;
    }
    size_t index_granularity_bytes = 0;
    if (adaptive_parts >= parts.size() / 2)
        index_granularity_bytes = data_settings->index_granularity_bytes;
    const size_t max_marks_to_use_cache = roundRowsOrBytesToMarks(
        settings.merge_tree_max_rows_to_use_cache,
        settings.merge_tree_max_bytes_to_use_cache,
        data_settings->index_granularity,
        index_granularity_bytes);
    if (sum_marks > max_marks_to_use_cache)
        use_uncompressed_cache = false;
    if (num_streams > settings.max_final_threads)
        num_streams = settings.max_final_threads;