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2020829 - Distinct query causes server crash for certain collations - SAP IQ

Symptom

  • Simple distinct query causes server crash with stacktrace on hs_ohcGroup<class s_btfdiskblock,class s_btfitem>::GetUnconditionedKey.
  • Collation ISO9LATIN1 or 1257LIT
  • Query : select distinct T_col from T_sp04
  • It happens while fetching results
  • The stacktrace include the following functions:

**************************************************
***   Sybase IQ Abort:
***      From:  stcxtlib\st_server.cxx:762
***      PID: 27508
***      Message: Program Abort
***      Thread: 10512  (TID: 2)
**************************************************

RtlUnwindEx
KiUserExceptionDispatcher
memmove
 hs_ohcGroup<class s_btfdiskblock,class s_btfitem>::GetUnconditionedKey
__cdecl hs_ohcGroup<class s_btdiskblock,class s_btitem>::FetchOrdered
__cdecl s_fetchOrdered::Fetch
__cdecl vp_Cursor::Fetch
__cdecl dfo::Fetch
__cdecl dfo_Cursor::FetchOpus
__cdecl st_cursorIQtoSA::FetchRows
__cdecl st_cursorIQtoSA::Execute
__cdecl df_OpenCursor::Execute
__cdecl st_command::DoCmdThroughResourceGate
__cdecl st_iqdml::OpenCursor


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Environment

SAP IQ 16 SP04 & SP03.

Product

SAP IQ 16.0

Keywords

GetUnconditionedKey, FetchOrdered, hs_ohcGroup, st_server.cxx, 760106, CR760106 , KBA , BC-SYB-IQ , Sybase IQ , Bug Filed

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