DSBulk count doesn't work on tables with just partition keys

[msmygit]

Let's have a table like below:

CREATE TABLE ks_name.tbl_name (
    s_id bigint,
    c_id bigint,
    status boolean,
    uid_ts timestamp,
    uids text,
    PRIMARY KEY ((s_id, c_id))
);

There is only partition key. We're using version 1.10.0.

When we run ./dsbulk count -h <host> -u <user> -p <pswd> --stats.modes partitions --stats.numPartitions 20 on this table, we get an error as follows:

Cannot count partitions for table tbl_name: it has no clustering columns

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