(4.1 version, with post-review fixes)
The fix for another Bug (6439) limited FROM_UNIXTIME() to
TIMESTAMP_MAX_VALUE which is 2145916799 or 2037-12-01 23:59:59 GMT,
however unix timestamp in general is not considered to be limited
by this value. All dates up to power(2,31)-1 are valid.
This patch extends allowed TIMESTAMP range so, that max
TIMESTAMP value is power(2,31)-1. It also corrects
FROM_UNIXTIME() and UNIX_TIMESTAMP() functions, so that
max allowed UNIX_TIMESTAMP() is power(2,31)-1. FROM_UNIXTIME()
is fixed accordingly to allow conversion of dates up to
2038-01-19 03:14:07 UTC. The patch also fixes CONVERT_TZ()
function to allow extended range of dates.
The main problem solved in the patch is possible overflows
of variables, used in broken-time representation to time_t
conversion (required for UNIX_TIMESTAMP).
From the manual:
date arithmetic operations require complete dates and do not work with
incomplete dates such as '2006-07-00' or badly malformed dates.
- bug #11655 "Wrong time is returning from nested selects - maximum time exists
- input and output TIME values were not validated properly in several conversion functions
- bug #20927 "sec_to_time treats big unsigned as signed"
- integer overflows were not checked in several functions. As a result, input values like 2^32 or 3600*2^32 were treated as 0
- BIGINT UNSIGNED values were treated as SIGNED in several functions
- in cases where both input string truncation and out-of-range TIME value occur, only 'truncated incorrect time value' warning was produced
- Type casting was not consequent, thus when adding a DATE type with
a WEEK interval the result type was DATETIME and not DATE as is the
norm.
- By changing the order of the date internal enumerations the deviant
type casting is resolved (Item_date_add_interval::fix_length_and_dec()
which determines result type for this operation assumes that addition
of any interval with value <= INTERVAL_DAY to date value will result
in date). There are two independant places to change:
interval_names[] and interval_type.
- The definition of the result type of a type_date function didn't
include INTERVAL_WEEK
- This patch adds an explicit test for INTERVAL_WEEK which results
in the result type for an item_date_add_intervall operation
being DATE rather than DATETIME when one parameter is
INTERVAL_WEEK.
Fix when __attribute__() is stubbed out, add ATTRIBUTE_FORMAT() for specifying
__attribute__((format(...))) safely, make more use of the format attribute,
and fix some of the warnings that this turns up (plus a bonus unrelated one).
time_format() claimed %H and %k would return at most two digits
(hours 0-23), but this coincided neither with actual behaviour
nor with docs. this is not visible in simple queries; forcing
a temp-table is probably the easiest way to see this. adjusted
the return-length appropriately; the alternative would be to
adjust the docs to say that behaviour for > 99 hours is undefined.
---
Bug#19844: time_format in Union truncates values
time_format() claimed %H and %k would return at most two digits
(hours 0-23), but this coincided neither with actual behaviour
nor with docs. this is not visible in simple queries; forcing
a temp-table is probably the easiest way to see this. adjusted
the return-length appropriately; the alternative would be to
adjust the docs to say that behaviour for > 99 hours is undefined.
str_to_date() would sometimes render NULL if %D was used as rule other than last.
since this was due to two pointers getting mixed up in the server, this behaviour
seemed somewhat non-deterministic at SQL level.
difference between timestamp in values of months and quarters.)
Problem: when requesting timestamp diff in months or quarters, it
would only examine the date (and not the time) for the comparison.
Solution: increased precision of comparison.
