Data load through PDi adapter appears corrupted in the database

1. Start bulk load of a large CSV file with pentaho bulk load adapter. File contains 121 million rows (9 GB in size).
2. The load inserts data into table where all columns are of type = Varchar (256)

CREATE TABLE F_TRANS_DELTA (

trans_id       VARCHAR(256) NULL,

customer_id    VARCHAR(256) NULL,

merchant_id    VARCHAR(256) NULL,

card_id        VARCHAR(256) NULL,

trans_datetime VARCHAR(256) NULL,

trans_type     VARCHAR(256) NULL,

amount         VARCHAR(256) NULL,

reversed       VARCHAR(256) NULL,

response_code  VARCHAR(256) NULL,

is_first_topup VARCHAR(256) NULL

) ENGINE=Columnstore DEFAULT CHARSET=utf8;

3. The pentaho job finished successfully and the data seems to be inserted into the database.
4. The following queries can be executed succesfully:

select * from f_trans_delta limit 10;

select count(*) from f_trans_delta;

5. Run query:

select * from f_trans_delta where merchant_id='12558';

Result:
1. Error in mcsmysql client:
ERROR 1815 (HY000): Internal error: IDB-2035: An internal error occurred. Check the error log file & contact support.
2. Error in messages log file on PM1:
Apr 12 13:12:04 mariadb-59f24c1f-215-1 Calpont[801]: 04.760635 |0|0|0| E 00 CAL0000: /data/buildbot/bb-worker/nightly-rpm-centos7/build/mariadb-columnstore-server/mariadb-columnstore-engine/primitives/primproc/dictstep.cpp@353: assertion 'pt[primMsg->NVALS].offsetIndex != 0' failed
Apr 12 13:12:04 mariadb-59f24c1f-215-1 PrimProc[801]: 04.761228 |0|0|0| W 28 CAL0000: IDB-2035: An internal error occurred. Check the error log file & contact support.

Expected:
Successful query execution.