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MCOL-4516 check for var_pop < 0

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In some cases, because of rounding error, var_pop will evaluate to some value just less than 0. We check for this and force to round to 0.
This commit is contained in:
David Hall
2021-03-09 13:36:10 -06:00
parent 508d5455a8
commit af20387985
8 changed files with 37 additions and 26 deletions
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4
utils/regr/corr.cpp
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@ -160,13 +160,13 @@ mcsv1_UDAF::ReturnCode corr::evaluate(mcsv1Context* context, static_any::any& va
long double sumxy = data->sumxy;
long double var_popx = (sumx2 - (sumx * sumx / N)) / N;
if (var_popx == 0)
if (var_popx <= 0) // Catch -0
{
// When var_popx is 0, NULL is the result.
return mcsv1_UDAF::SUCCESS;
}
long double var_popy = (sumy2 - (sumy * sumy / N)) / N;
if (var_popy == 0)
if (var_popy <= 0) // Catch -0
{
// When var_popy is 0, NULL is the result
return mcsv1_UDAF::SUCCESS;