select genbson(ROW('01.01.2000','t')::ROW(pdate date,flag boolean),1,1)::JSON
from systables
where tabid==1


возвращает


(expression) {"pdate":ISODate("2000-01-01T00:00:00.000Z")}


т.е. булевское значение побила моль.
Но это еще пол беды.
При трассировке таких приколов в ХП возникает

17:46:54 Assert Failed: Exception Caught. Type: MT_EX_OS, Context: mem
17:46:54 IBM Informix Dynamic Server Version 12.10.FC10
17:46:54 Who: Session(52, informix@scoring, 30187, 0x5447a858)
Thread(87, sqlexec, 544392e8, 1)
File: mtex.c Line: 420
17:46:54 Action: Please notify IBM Informix Technical Support.
17:46:54 stack trace for pid 29559 written to /opt/informix/tmp/af.43f915d
17:46:55 See Also: /opt/informix/tmp/af.43f915d
17:46:57 Exception Caught. Type: MT_EX_OS, Context: mem
17:46:57 (-9791): ERROR: Routine execution trap -- procname=<get_lvobj_bson> procid=5672
reason: mem
17:46:59 Assert Failed: Exception Caught. Type: MT_EX_OS, Context: mem
17:46:59 IBM Informix Dynamic Server Version 12.10.FC10
17:46:59 Who: Session(52, informix@scoring, 30187, 0x5447a858)
Thread(87, sqlexec, 544392e8, 1)
File: mtex.c Line: 420
17:46:59 Action: Please notify IBM Informix Technical Support.
17:46:59 stack trace for pid 29559 written to /opt/informix/tmp/af.43f915d
17:47:00 See Also: /opt/informix/tmp/af.43f915d
17:47:02 Exception Caught. Type: MT_EX_OS, Context: mem
17:47:02 aborting stored procedure cursor cleanup
17:47:02 Assert Failed: No Exception Handler
17:47:02 IBM Informix Dynamic Server Version 12.10.FC10
17:47:02 Who: Session(52, informix@scoring, 30187, 0x5447a858)
Thread(87, sqlexec, 544392e8, 1)
File: mtex.c Line: 508
17:47:02 Results: Exception Caught. Type: MT_EX_OS, Context: mem
17:47:02 Action: Please notify IBM Informix Technical Support.
17:47:02 See Also: /opt/informix/tmp/af.43f915d
17:47:04 Thread ID 87 will now be suspended.
17:49:57 Checkpoint Completed: duration was 0 seconds.
17:49:57 Mon Mar 16 - loguniq 82041, logpos 0x2cf030c, timestamp: 0x8ed0d071 Interval: 271887

Абидна !