RANK_POSITION_LOG_BUCKETS_BEGIN
#define RANK_POSITION_DISTINCT_COUNT_CUTOFF (RANK_POSITION_LOG_BUCKETS_BEGIN + ZSTD_highbit32(RANK_POSITION_LOG_BUCKETS_BEGIN) /* == 166 */)
: ZSTD_highbit32(count) + RANK_POSITION_LOG_BUCKETS_BEGIN;