Round off random_normal() test results one more decimal place.
As I suspected, some machines have even more low-order-bit inaccuracy than the ones I tested. Tweak new test so that (hopefully) it will pass everywhere. Per buildfarm. Discussion: https://postgr.es/m/4173840.1673290336@sss.pgh.pa.us
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@ -113,34 +113,34 @@ SELECT random() FROM generate_series(1, 10);
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-- Likewise for random_normal(); however, since its implementation relies
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-- on libm functions that have different roundoff behaviors on different
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-- machines, we have to round off the results a bit to get consistent output.
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SET extra_float_digits = 0;
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SET extra_float_digits = -1;
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SELECT random_normal() FROM generate_series(1, 10);
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random_normal
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--------------------
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0.208534644938377
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0.264530240540963
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-0.606752467900428
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0.825799427852654
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1.70111611735357
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-0.223445463716189
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0.249712419190998
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-1.2494722990669
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0.125627152043677
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0.475391614544013
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random_normal
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-------------------
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0.20853464493838
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0.26453024054096
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-0.60675246790043
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0.82579942785265
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1.7011161173536
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-0.22344546371619
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0.249712419191
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-1.2494722990669
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0.12562715204368
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0.47539161454401
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(10 rows)
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SELECT random_normal(mean => 1, stddev => 0.1) r FROM generate_series(1, 10);
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r
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-------------------
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1.00605972811732
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1.09685453015002
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1.02869206132007
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0.909475676712336
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0.983724763134265
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0.939344549577623
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1.18713500206363
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0.962257684292933
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0.914441206800407
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0.964031055575433
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r
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------------------
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1.0060597281173
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1.09685453015
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1.0286920613201
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0.90947567671234
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0.98372476313426
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0.93934454957762
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1.1871350020636
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0.96225768429293
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0.91444120680041
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0.96403105557543
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(10 rows)
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@ -79,7 +79,7 @@ SELECT random() FROM generate_series(1, 10);
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-- Likewise for random_normal(); however, since its implementation relies
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-- on libm functions that have different roundoff behaviors on different
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-- machines, we have to round off the results a bit to get consistent output.
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SET extra_float_digits = 0;
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SET extra_float_digits = -1;
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SELECT random_normal() FROM generate_series(1, 10);
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SELECT random_normal(mean => 1, stddev => 0.1) r FROM generate_series(1, 10);
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