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2262843 - 'Union' Query caused error 'opt_ShadowTransform.cxx' -SAP IQ

Symptom

During migration project, 'opt_ShadowTransform.cxx' error is retured when executing an Insert-Select including union all.
   
  Excerpt of IQMSG

     ********************************************************              
     **                                                                    
     **       Non-Fatal IQ Internal Error Detected                         
     **       at optlib/opt_ShadowTransform.cxx:846  on thread 150 (TID 9) 
     ...
    ..df_Exception16ThrowException_0EPKciNS_12df_ErrorCodeE
   ..opt_Driver..AddParallelShadowSubtreesEP3dfo ..
   ..opt_Driver..AddParallelShadowSubtreesEP3dfo ..
   ..opt_Driver..AddParallelShadowSubtreesEP3dfo ..
   ..opt_Driver..AddParallelShadowSubtreesEP3dfo ..
   ..opt_Driver..AddParallelShadowSubtreesEP3dfo ..
   ..opt_Driver..AddParallelShadowSubtreesEP3dfo ..
   ..opt_Driver..AddParallelShadowSubtreesEP3dfo ..
   ..opt_Driver.GenerateTreeEP9QueryNodeP9st_cursor ..
   ..db_InsertRoot.ExecuteEv ..


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Environment

SAP IQ 16.0

Product

SAP IQ 16.0 ; SAP Sybase IQ 15.2 ; SAP Sybase IQ 15.4 ; Sybase IQ 12.7

Keywords

AddParallelShadowSubtree ; "opt_ShadowTransform.cxx" ; CR#794109 ; CR 794109; 794109 , KBA , BC-SYB-IQ , Sybase IQ , Problem

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