Overallocation of blocks with LONGBLOB

CREATE TABLE IF NOT EXISTS sessions (

  k_idjob int NOT NULL,

  t_ver varchar(255) DEFAULT NULL,

  b_data longblob DEFAULT NULL 

) ENGINE=Columnstore;

try

        {

            bulk = driver->createBulkInsert("test_cs", "sessions", 0, 0);

            for (i = 0; i < nrecs; i++)

            {

                bulk->setColumn(0, (i + 1));        // int NOT NULL

                bulk->setColumn(1, "blob test");    // varchar

                bulk->setColumn(2, str.c_str(), str.length() ); // blob

                bulk->writeRow();

                totrecs++;

            }

            bulk->commit(); // commit nrecs 

            summary = bulk->getSummary();

            std::cout << "BulkInsert Block " << j << ": " << summary.getRowsInsertedCount() << " records inserted in " << summary.getExecutionTime() << " seconds, total " << totrecs << std::endl;

        }

        catch (mcsapi::ColumnStoreError &e1) 

        {

            std::cout << "BulkInsert Block " << j << " error caught: " << e1.what() << std::endl;

            bulk->rollback();

        }

        if (bulk!=nullptr)

            delete bulk;

        bulk = nullptr;

MariaDB [test_cs]> select * from information_schema.columnstore_files;

+-----------+------------+--------------+------------------------------------------------------------------------------------------+-------------+----------------------+

| OBJECT_ID | SEGMENT_ID | PARTITION_ID | FILENAME                                                                                 | FILE_SIZE   | COMPRESSED_DATA_SIZE |

+-----------+------------+--------------+------------------------------------------------------------------------------------------+-------------+----------------------+

|      3003 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/187.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3004 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/188.dir/000.dir/FILE000.cdf |     1056768 |                73728 |

|      3005 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/189.dir/000.dir/FILE000.cdf |     1056768 |                73728 |

|      3006 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/190.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3007 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/191.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3008 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/192.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3009 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/193.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3010 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/194.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3011 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/195.dir/000.dir/FILE000.cdf |     1056768 |                73728 |

|      3012 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/196.dir/000.dir/FILE000.cdf |     1056768 |                73728 |

|      3013 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/197.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3014 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/198.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3015 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/199.dir/000.dir/FILE000.cdf |     2105344 |               122880 |

|      3016 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/200.dir/000.dir/FILE000.cdf |     2113536 |               229376 |

|      3017 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/201.dir/000.dir/FILE000.cdf |     2113536 |               229376 |

|      3018 |          0 |            0 | /usr/local/mariadb/columnstore/data1/000.dir/000.dir/011.dir/202.dir/000.dir/FILE000.cdf | 14697111552 |            746594304 |

+-----------+------------+--------------+------------------------------------------------------------------------------------------+-------------+----------------------+