```
CREATE TABLE t (x UInt8, PROJECTION p (SELECT x GROUP BY x)) ENGINE = MergeTree ORDER BY ();
INSERT INTO t VALUES (0);

SET group_by_overflow_mode = 'any', max_rows_to_group_by = 1000, totals_mode = 'after_having_auto';
SELECT x FROM t GROUP BY x WITH TOTALS;
```
throw Exception(message, ErrorCodes::BAD_TTL_EXPRESSION);
            }
        }
    }
}
void MergeTreeData::checkStoragePolicy(const StoragePolicyPtr & new_storage_policy) const
{
    const auto old_storage_policy = getStoragePolicy();
    old_storage_policy->checkCompatibleWith(new_storage_policy);
}
void MergeTreeData::MergingParams::check(const StorageInMemoryMetadata & metadata) const
{
    const auto columns = metadata.getColumns().getAllPhysical();
    if (!sign_column.empty() && mode != MergingParams::Collapsing && mode != MergingParams::VersionedCollapsing)
        throw Exception("Sign column for MergeTree cannot be specified in modes except Collapsing or VersionedCollapsing.",
                        ErrorCodes::LOGICAL_ERROR);
    if (!version_column.empty() && mode != MergingParams::Replacing && mode != MergingParams::VersionedCollapsing)
        throw Exception("Version column for MergeTree cannot be specified in modes except Replacing or VersionedCollapsing.",
                        ErrorCodes::LOGICAL_ERROR);
    if (!columns_to_sum.empty() && mode != MergingParams::Summing)
        throw Exception("List of columns to sum for MergeTree cannot be specified in all modes except Summing.",
                        ErrorCodes::LOGICAL_ERROR);
    
    auto check_sign_column = [this, & columns](bool is_optional, const std::string & storage)
    {
        if (sign_column.empty())
        {
            if (is_optional)
                return;
            throw Exception("Logical error: Sign column for storage " + storage + " is empty", ErrorCodes::LOGICAL_ERROR);