2972659 - Reason for error "339: invalid number"

"ERROR [SQL-339]" or "error 339" is shown frequently, in both ABAP dumps and HANA traces:

• failed to encode cursor: ERROR [SQL-339] invalid number: not a valid number string 'true' at implicit type conversion
• error 339 at OPC

Indexserver trace:

46229]{338408}[-1/-1] 2024-08-08 09:22:15.881768 e SQLSession       sm_codec_newdb.cc(08885) : failed to encode itab result sets: ERROR [SQL-339] invalid number: SQL Error
at ptime/query/plan_executor/dml/hex/qe_hex_search.cc:513
exception  1: no.71000339  (ptime/query/plan_executor/dml/hex/qe_hex_search.cc:513) TID: 46229
    SQL Error

 NO exception throw location recorded. Stack generation suppressed.

exception type information:
- 0: public ptime::SQLException@0x00007fff92d62d18 SI
   - 0: public ptime::SQLExceptionBase@0x00007fff92d61a80 SI
     - 0: public Diagnose::UserFacingExceptionBase@0x00007fff92d5ffd0 SI
       - 0: public ltt::exception@0x00007fff6a71f340

ST22 dump:

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

SAP HANA, platform edition

"failed to encode cursor: ERROR [SQL-339] invalid number: not a valid number string 'true' at implicit type conversion", error 339 at OPC, SQLException 46229]{338408}[-1/-1] 2024-08-08 09:22:15.881768 e SQLSession       sm_codec_newdb.cc(08885) : failed to encode itab result sets: ERROR [SQL-339] invalid number: SQL Errorat ptime/query/plan_executor/dml/hex/qe_hex_search.cc:513exception  1: no.71000339  (ptime/query/plan_executor/dml/hex/qe_hex_search.cc:513) TID: 46229    SQL Error NO exception throw location recorded. Stack generation suppressed.exception type information:- 0: public ptime::SQLException@0x00007fff92d62d18 SI   - 0: public ptime::SQLExceptionBase@0x00007fff92d61a80 SI     - 0: public Diagnose::UserFacingExceptionBase@0x00007fff92d5ffd0 SI       - 0: public ltt::exception@0x00007fff6a71f340 , KBA , HAN-DB , SAP HANA Database , Problem