FIX: Correlated Subquery Containing UNION ALL May Cause Access Violation

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Article ID: 299544 - View products that this article applies to.
This article was previously published under Q299544
This article has been archived. It is offered "as is" and will no longer be updated.
BUG #: 351658 (SHILOH_BUGS)
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If a correlated subquery uses the UNION ALL clause, SQL Server may produce an access violation (AV) and stack trace.


To resolve this problem, obtain the latest service pack for SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
290211 INF: How to Obtain the Latest SQL Server 2000 Service Pack


Avoid the use of the UNION ALL clause.


Microsoft has confirmed that this is a problem in SQL Server 2000. This problem was first corrected in SQL Server 2000 Service Pack 1.


The following query demonstrates the problem:
Use northwind
SELECT  LastName,
  (SELECT SUM(CONVERT(int,extension))
   (select * from employees e1 
     where e1.reportsto = e0.employeeid 
     and city  = 'seattle' UNION ALL
     select * from employees e2 
     where e2.reportsto = e0.employeeid 
     and city = 'london') as reportsInSeattleAndLondon )
  FROM employees e0
The SQL Server Errorlog may contain a stack trace that resembles the following:
0055AA6C Module(sqlservr+0015AA6C) (CBitSet::FGetNext(class CBitSetToken &,unsigned long &)const +0000001A)
0055A9F9 Module(sqlservr+0015A9F9) (CPvrBitSet::FGetNext(class CPvrBitSetToken &,class CValRef * &)const +0000001D)
00594916 Module(sqlservr+00194916) (CTableGroupProperties::FAnyUsedColsAreBound(class CPvrBitSet *)+00000025)
007BB09D Module(sqlservr+003BB09D) (CSubRuleApplyHandlerBase::FInnerColsFunctionallyDetermined(class DRgPExpr *,class CTableGroupProperties *,class DRgCId *)+0000003D)
007BB313 Module(sqlservr+003BB313) (CSubRuleApplyHandlerBase::FSubstSGb(class COptExpr *,class CTableGroupProperties *,class COptExpr *,class COptExpr * *,class DRgPExpr *,class CTDynArray<enum JOINTYPE,class CFnI_NULL<enum JOINTYPE> > *,class DRgPExpr 
007BC0B8 Module(sqlservr+003BC0B8) (CSubRuleApplyHandlerBase::BuildSubstitutes(class COptExpr *,class CRuleContext *,class CRuleReturn *)+0000015C)
0055D6CF Module(sqlservr+0015D6CF) (COptContext::PexprTransformTopLevel(class COptExpr *,class CActiveRuleArray *,class CMoveSorter *)+0000019E)
0055D846 Module(sqlservr+0015D846) (COptContext::PexprNormalize(class COptExpr *,class CActiveRuleArray *,class CMoveSorter *)+00000034)
0055E8F1 Module(sqlservr+0015E8F1) (CMemo::NormalizeQuery(class CQuery *,class COptExpr *)+0000006E)
0055E7B6 Module(sqlservr+0015E7B6) (COptContext::PexprSimplify(class COptExpr *)+000000F6)
0055DE4F Module(sqlservr+0015DE4F) (COptContext::PcxteOptimizeQuery(class COptExpr *,class DRgCId *)+000004E5)
0055FFBB Module(sqlservr+0015FFBB) (CQuery::Optimize(void)+00000416)
0055FD54 Module(sqlservr+0015FD54) (CQuery::Optimize(unsigned long)+00000030)
005642C6 Module(sqlservr+001642C6) (CCvtTree::PqryFromTree(class TREE *,class IMemObj *,class CRangeCollection *,unsigned long,class CCompPlan *)+000002C4)
00564019 Module(sqlservr+00164019) (BuildQueryFromTree(class TREE *,class IMemObj *,class IMemObj *,class IQueryObj * *,class CRangeCollection *,unsigned long,class CCompPlan *)+00000046)
00563F78 Module(sqlservr+00163F78) (CStmtQuery::InitQuery(class CAlgStmt *,class CCompPlan *,unsigned long)+0000014B)
0049DA48 Module(sqlservr+0009DA48) (CStmtSelect::Init(class CAlgStmt *,class CCompPlan *,class IBrowseMode *)+00000091)
00447078 Module(sqlservr+00047078) (CCompPlan::FCompileStep(class CAlgStmt *,class CStatement * *)+00000AE7)
004510FE Module(sqlservr+000510FE) (CProchdr::FCompile(class CCompPlan *,class CParamExchange *)+00000D15)
00415080 Module(sqlservr+00015080) (CSQLSource::FTransform(class CParamExchange *)+0000037C)
004592CE Module(sqlservr+000592CE) (CSQLStrings::FTransform(class CParamExchange *)+000001A8)
0041534F Module(sqlservr+0001534F) (CSQLSource::Execute(class CParamExchange *)+00000176)
00459A54 Module(sqlservr+00059A54) (language_exec(struct srv_proc *)+000003C8)
004175D8 Module(sqlservr+000175D8) (process_commands(struct srv_proc *)+000000E0)
410735D0 Module(UMS+000035D0) (ProcessWorkRequests(class UmsWorkQueue *)+00000264)
4107382C Module(UMS+0000382C) (ThreadStartRoutine(void *)+000000BC)
7800BEA1 Module(MSVCRT+0000BEA1) (_beginthread+000000CE)
77E92CA8 Module(KERNEL32+00012CA8) (CreateFileA+0000011B)


Article ID: 299544 - Last Review: January 16, 2015 - Revision: 3.2
  • Microsoft SQL Server 2000 Standard Edition
kbnosurvey kbarchive kbbug kbfix kbsqlserv2000sp1fix KB299544

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