Error 1815 after several executions of example/basic_bulk_insert having SMALLINT in t1

After several executions of example/basic_bulk_insert the query
SELECT * FROM test.t1;
results in:
Error Code: 1815. Internal error: An unexpected condition within the query caused an internal processing error within InfiniDB. Please check the log files for more details. Additional Information: error in BatchPrimitiveProces
The crit.log has:
Oct 23 20:02:41 s_columnstore@mcs11 PrimProc[4175]: 41.881088 |0|0|0| C 28 CAL0000: /home/builder/mariadb-columnstore-server/mariadb-columnstore-engine/primitives/primproc/columncommand.cpp error on projectResultRG for oid 3248 lbid 2053120: input rids 3, output rids 2

The error is cleared by executing
select calFlushCache();
or restarting the columnstore system.

To reproduce the issue one must change the t1 table definition to have SMALLINT:

CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`b` smallint(6) DEFAULT NULL
) ENGINE=Columnstore;