presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/NativeCassandraSession.java/NativeCassandraSession/queryPartitionKeysWithInClauses
class NativeCassandraSession:    private Iterable<Row> queryPartitionKeysWithInClauses(CassandraTable table, List<Set<Object>> filterPrefixes)
    {
        CassandraTableHandle tableHandle = table.getTableHandle();
        List<CassandraColumnHandle> partitionKeyColumns = table.getPartitionKeyColumns();

        Select partitionKeys = CassandraCqlUtils.selectDistinctFrom(tableHandle, partitionKeyColumns);
        addWhereInClauses(partitionKeys.where(), partitionKeyColumns, filterPrefixes);

        return execute(partitionKeys).all();
    }