If they are defined, they can override table-level settings.
{
    return getContext()->getMergeList().getMergesWithTTLCount();
}
void MergeTreeData::addPartContributionToDataVolume(const DataPartPtr & part)
{
    increaseDataVolume(part->getBytesOnDisk(), part->rows_count, 1);
}
void MergeTreeData::removePartContributionToDataVolume(const DataPartPtr & part)
{
    increaseDataVolume(-part->getBytesOnDisk(), -part->rows_count, -1);
}
void MergeTreeData::increaseDataVolume(ssize_t bytes, ssize_t rows, ssize_t parts)
{
    total_active_size_bytes.fetch_add(bytes, std::memory_order_acq_rel);
    total_active_size_rows.fetch_add(rows, std::memory_order_acq_rel);
    total_active_size_parts.fetch_add(parts, std::memory_order_acq_rel);
}
void MergeTreeData::setDataVolume(size_t bytes, size_t rows, size_t parts)
{
    total_active_size_bytes.store(bytes, std::memory_order_release);
    total_active_size_rows.store(rows, std::memory_order_release);
    total_active_size_parts.store(parts, std::memory_order_release);
}
bool MergeTreeData::insertQueryIdOrThrow(const String & query_id, size_t max_queries) const