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Alter scale selection for NUMERIC division and transcendental functions

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so that precision of result is always at least as good as you'd get from
float8 arithmetic (ie, always at least 16 digits of accuracy).  Per
pg_hackers discussion a few days ago.
This commit is contained in:
Tom Lane
2002-10-02 19:21:26 +00:00
parent c74c7e604c
commit b813d143ae
3 changed files with 350 additions and 135 deletions
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18
src/test/regress/expected/aggregates.out
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@@ -2,15 +2,15 @@
-- AGGREGATES
--
SELECT avg(four) AS avg_1 FROM onek;
avg_1
--------------
1.5000000000
avg_1
---------------------
1.50000000000000000
(1 row)
SELECT avg(a) AS avg_32 FROM aggtest WHERE a < 100;
avg_32
---------------
32.6666666667
avg_32
--------------------
32.666666666666667
(1 row)
-- In 7.1, avg(float4) is computed using float8 arithmetic.
@@ -118,9 +118,9 @@ select ten, count(four), sum(DISTINCT four) from onek group by ten;
(10 rows)
SELECT newavg(four) AS avg_1 FROM onek;
avg_1
--------------
1.5000000000
avg_1
---------------------
1.50000000000000000
(1 row)
SELECT newsum(four) AS sum_1500 FROM onek;