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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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if input year for date_add() / date_sub() with INTERVAL is low enough for
calc_daynr() to possibly return incorrect results (calc_daynr() has no information
on whether the year is low because it was a two-digit year ('77) or because it
was a really low four-digit year (0077) and will indiscriminately try to turn the
value into a four-digit year by adding 1900 or 2000 respectively), the functions
will now throw NULL.
include/my_time.h:
new define YY_MAGIC_BELOW: if year is below this threshold, magic kicks in in
calc_daynr(). the idea is to convert two-digit years to four-digit ones, adding
1900 to values >= YY_PART_YEAR or adding 2000 otherwise.
current value of YY_MAGIC_BELOW derived from original code in calc_daynr()
mysql-test/r/func_time.result:
test where 2 digit -> 4 digit year magic kicks in, and whether we throw NULL when
it happens
mysql-test/t/func_time.test:
test where 2 digit -> 4 digit year magic kicks in, and whether we throw NULL when
it happens
sql-common/my_time.c:
use new const YY_MAGIC_BELOW, apply 2-digit -> 4-digit magic only to years
below this threshold.
sql/item_timefunc.cc:
throw NULL when year in date_add() / date_sub() would be affected by
2 digit -> 4 digit magic.
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