Inconsistent results caused by internal optimization gone wrong

I’m getting different results on the same environment/cluster from one run to another.  

Boca_ProdGit

W20180501-123511 – uid_results has 10 records

W20180501-123620 – I added some additional outputs to see a few intermediate steps, ran again, now uid_results has 3 records

Gavin started looking at it. It looks like an internal optimization is going wrong.  The work around is to add NOCOMBINE to prevent that optimization occurring.

 Two potential places:

 MEOW_Biz.ecl(73):

  export RR2 := PROJECT(RR20,AdjustScores(LEFT));

change to

  export RR2 := NOCOMBINE(PROJECT(RR20,AdjustScores(LEFT)));

Alternatively, InsuranceHeader_xLink\Process_xIDL_Layouts.ecl(653)

  RETURN SORT(GROUP(R2,Reference,ALL),-weight,DID);

Change to

  RETURN SORT(GROUP(NOCOMBINE(R2),Reference,ALL),-weight,DID);