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Allow to_timestamp(float8) to convert float infinity to timestamp infinity.

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With the original SQL-function implementation, such cases failed because
we don't support infinite intervals.  Converting the function to C lets
us bypass the interval representation, which should be a bit faster as
well as more flexible.

Vitaly Burovoy, reviewed by Anastasia Lubennikova
This commit is contained in:
Tom Lane
2016-03-29 17:09:21 -04:00
parent 96f8373cad
commit e511d878f3
7 changed files with 149 additions and 26 deletions
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47
src/test/regress/expected/timestamptz.out
View File

@ -2307,6 +2307,53 @@ SELECT make_timestamptz(2007, 12, 9, 3, 0, 0, 'VET');
Sun Dec 09 07:30:00 2007 UTC
(1 row)
SELECT to_timestamp( 0); -- 1970-01-01 00:00:00+00
to_timestamp
------------------------------
Thu Jan 01 00:00:00 1970 UTC
(1 row)
SELECT to_timestamp( 946684800); -- 2000-01-01 00:00:00+00
to_timestamp
------------------------------
Sat Jan 01 00:00:00 2000 UTC
(1 row)
SELECT to_timestamp(1262349296.7890123); -- 2010-01-01 12:34:56.789012+00
to_timestamp
-------------------------------------
Fri Jan 01 12:34:56.789012 2010 UTC
(1 row)
-- edge cases
SELECT to_timestamp(-1e20::float8); -- error, out of range
ERROR: timestamp out of range: "-1e+20"
SELECT to_timestamp(-210866803200.0625); -- error, out of range
ERROR: timestamp out of range: "-2.10867e+11"
SELECT to_timestamp(-210866803200); -- 4714-11-24 00:00:00+00 BC
to_timestamp
---------------------------------
Mon Nov 24 00:00:00 4714 UTC BC
(1 row)
-- The upper boundary differs between integer and float timestamps, so check the biggest one
SELECT to_timestamp(185331707078400::float8); -- error, out of range
ERROR: timestamp out of range: "1.85332e+14"
-- nonfinite values
SELECT to_timestamp(' Infinity'::float);
to_timestamp
--------------
infinity
(1 row)
SELECT to_timestamp('-Infinity'::float);
to_timestamp
--------------
-infinity
(1 row)
SELECT to_timestamp('NaN'::float);
ERROR: timestamp cannot be NaN
SET TimeZone to 'Europe/Moscow';
SELECT '2011-03-26 21:00:00 UTC'::timestamptz;
timestamptz

15
src/test/regress/sql/timestamptz.sql
View File

@ -403,6 +403,21 @@ SELECT '2007-12-09 04:00:00'::timestamp AT TIME ZONE 'VET';
SELECT make_timestamptz(2007, 12, 9, 2, 0, 0, 'VET');
SELECT make_timestamptz(2007, 12, 9, 3, 0, 0, 'VET');
SELECT to_timestamp( 0); -- 1970-01-01 00:00:00+00
SELECT to_timestamp( 946684800); -- 2000-01-01 00:00:00+00
SELECT to_timestamp(1262349296.7890123); -- 2010-01-01 12:34:56.789012+00
-- edge cases
SELECT to_timestamp(-1e20::float8); -- error, out of range
SELECT to_timestamp(-210866803200.0625); -- error, out of range
SELECT to_timestamp(-210866803200); -- 4714-11-24 00:00:00+00 BC
-- The upper boundary differs between integer and float timestamps, so check the biggest one
SELECT to_timestamp(185331707078400::float8); -- error, out of range
-- nonfinite values
SELECT to_timestamp(' Infinity'::float);
SELECT to_timestamp('-Infinity'::float);
SELECT to_timestamp('NaN'::float);
SET TimeZone to 'Europe/Moscow';
SELECT '2011-03-26 21:00:00 UTC'::timestamptz;