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Improve regression tests for degree-based trigonometric functions.

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Print the actual value of each function result that's expected to be exact,
rather than merely emitting a NULL if it's not right.  Although we print
these with extra_float_digits = 3, we should not trust that the platform
will produce a result visibly different from the expected value if it's off
only in the last place; hence, also include comparisons against the exact
values as before.  This is a bit bulkier and uglier than the previous
printout, but it will provide more information and be easier to interpret
if there's a test failure.

Discussion: <18241.1461073100@sss.pgh.pa.us>
This commit is contained in:
Tom Lane
2016-04-19 16:47:21 -04:00
parent a0382e2d7e
commit 4db0d2d2fe
5 changed files with 400 additions and 270 deletions
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50
src/test/regress/sql/float8.sql
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@ -169,25 +169,47 @@ INSERT INTO FLOAT8_TBL(f1) VALUES ('-1.2345678901234e-200');
SELECT '' AS five, * FROM FLOAT8_TBL;
-- test exact cases for trigonometric functions in degrees
SELECT x,
CASE WHEN sind(x) IN (-1,-0.5,0,0.5,1) THEN sind(x) END AS sind,
CASE WHEN cosd(x) IN (-1,-0.5,0,0.5,1) THEN cosd(x) END AS cosd,
CASE WHEN tand(x) IN ('-Infinity'::float8,-1,0,
1,'Infinity'::float8) THEN tand(x) END AS tand,
CASE WHEN cotd(x) IN ('-Infinity'::float8,-1,0,
1,'Infinity'::float8) THEN cotd(x) END AS cotd
FROM generate_series(0, 360, 15) AS t(x);
SET extra_float_digits = 3;
SELECT x,
CASE WHEN asind(x) IN (-90,-30,0,30,90) THEN asind(x) END AS asind,
CASE WHEN acosd(x) IN (0,60,90,120,180) THEN acosd(x) END AS acosd,
CASE WHEN atand(x) IN (-45,0,45) THEN atand(x) END AS atand
sind(x),
sind(x) IN (-1,-0.5,0,0.5,1) AS sind_exact
FROM (VALUES (0), (30), (90), (150), (180),
(210), (270), (330), (360)) AS t(x);
SELECT x,
cosd(x),
cosd(x) IN (-1,-0.5,0,0.5,1) AS cosd_exact
FROM (VALUES (0), (60), (90), (120), (180),
(240), (270), (300), (360)) AS t(x);
SELECT x,
tand(x),
tand(x) IN ('-Infinity'::float8,-1,0,
1,'Infinity'::float8) AS tand_exact,
cotd(x),
cotd(x) IN ('-Infinity'::float8,-1,0,
1,'Infinity'::float8) AS cotd_exact
FROM (VALUES (0), (45), (90), (135), (180),
(225), (270), (315), (360)) AS t(x);
SELECT x,
asind(x),
asind(x) IN (-90,-30,0,30,90) AS asind_exact,
acosd(x),
acosd(x) IN (0,60,90,120,180) AS acosd_exact
FROM (VALUES (-1), (-0.5), (0), (0.5), (1)) AS t(x);
SELECT atand('-Infinity'::float8) = -90;
SELECT atand('Infinity'::float8) = 90;
SELECT x,
atand(x),
atand(x) IN (-90,-45,0,45,90) AS atand_exact
FROM (VALUES ('-Infinity'::float8), (-1), (0), (1),
('Infinity'::float8)) AS t(x);
SELECT x, y,
CASE WHEN atan2d(y, x) IN (-90,0,90,180) THEN atan2d(y, x) END AS atan2d
atan2d(y, x),
atan2d(y, x) IN (-90,0,90,180) AS atan2d_exact
FROM (SELECT 10*cosd(a), 10*sind(a)
FROM generate_series(0, 360, 90) AS t(a)) AS t(x,y);
RESET extra_float_digits;