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Support Article

FIRST aggregate in bucketed window is broken

SA-71533

Summary



FIRST aggregates do not provide the correct results when used in Sliding Time window together with Average aggregate.


Error Messages



Not Applicable


Steps to Reproduce

  1. Create SlidingTimeWindow (2min) > AVG(A), FIRST(A)
  2. Insert {A=10,time=10:00}{A=11,time=10:01}{A=12,time=10:02}

    Verify the output: {AVG=11.5, FIRST=1} expected: {AVG=11.5,FIRST=11}


Root Cause



A defect in Pegasystems’ code or rules.
Incorrect implementation of FirstAggregatorHolder.substractAggregate which used the propertyIndex to obtain the aggregate value.



Resolution



Update to Pega 8.1.3 patch release.


 
Suggest Edit

Published January 20, 2019 - Updated December 2, 2021

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