presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/DatabaseShardManager.java/DatabaseShardManager/getBucketAssignments
class DatabaseShardManager:    @Override
    public List<String> getBucketAssignments(long distributionId)
    {
        try {
            return bucketAssignmentsCache.getUnchecked(distributionId);
        }
        catch (UncheckedExecutionException e) {
            throwIfInstanceOf(e.getCause(), PrestoException.class);
            throw e;
        }
    }