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Tom Lane b2cbced9ee Support timezone abbreviations that sometimes change. ... Up to now, PG has assumed that any given timezone abbreviation (such as "EDT") represents a constant GMT offset in the usage of any particular region; we had a way to configure what that offset was, but not for it to be changeable over time. But, as with most things horological, this view of the world is too simplistic: there are numerous regions that have at one time or another switched to a different GMT offset but kept using the same timezone abbreviation. Almost the entire Russian Federation did that a few years ago, and later this month they're going to do it again. And there are similar examples all over the world. To cope with this, invent the notion of a "dynamic timezone abbreviation", which is one that is referenced to a particular underlying timezone (as defined in the IANA timezone database) and means whatever it currently means in that zone. For zones that use or have used daylight-savings time, the standard and DST abbreviations continue to have the property that you can specify standard or DST time and get that time offset whether or not DST was theoretically in effect at the time. However, the abbreviations mean what they meant at the time in question (or most recently before that time) rather than being absolutely fixed. The standard abbreviation-list files have been changed to use this behavior for abbreviations that have actually varied in meaning since 1970. The old simple-numeric definitions are kept for abbreviations that have not changed, since they are a bit faster to resolve. While this is clearly a new feature, it seems necessary to back-patch it into all active branches, because otherwise use of Russian zone abbreviations is going to become even more problematic than it already was. This change supersedes the changes in commit 513d06ded et al to modify the fixed meanings of the Russian abbreviations; since we've not shipped that yet, this will avoid an undesirably incompatible (not to mention incorrect) change in behavior for timestamps between 2011 and 2014. This patch makes some cosmetic changes in ecpglib to keep its usage of datetime lookup tables as similar as possible to the backend code, but doesn't do anything about the increasingly obsolete set of timezone abbreviation definitions that are hard-wired into ecpglib. Whatever we do about that will likely not be appropriate material for back-patching. Also, a potential free() of a garbage pointer after an out-of-memory failure in ecpglib has been fixed. This patch also fixes pre-existing bugs in DetermineTimeZoneOffset() that caused it to produce unexpected results near a timezone transition, if both the "before" and "after" states are marked as standard time. We'd only ever thought about or tested transitions between standard and DST time, but that's not what's happening when a zone simply redefines their base GMT offset. In passing, update the SGML documentation to refer to the Olson/zoneinfo/ zic timezone database as the "IANA" database, since it's now being maintained under the auspices of IANA.		11 years ago
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data	Add missing newlines at end of files	15 years ago
expected	Reduce messages about implicit indexes and sequences to DEBUG1.	13 years ago
sql	Add KNNGIST support to contrib/btree_gist.	15 years ago
.gitignore	Support "make check" in contrib	14 years ago
Makefile	Add file version information to most installed Windows binaries.	11 years ago
btree_bit.c	Initialize padding bytes in btree_gist varbit support.	11 years ago
btree_bytea.c	Create function prototype as part of PG_FUNCTION_INFO_V1 macro	11 years ago
btree_cash.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_date.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_float4.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_float8.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_gist--1.0.sql	Throw a useful error message if an extension script file is fed to psql.	14 years ago
btree_gist--unpackaged--1.0.sql	Fix typos in some error messages thrown by extension scripts when fed to psql.	11 years ago
btree_gist.c	Create function prototype as part of PG_FUNCTION_INFO_V1 macro	11 years ago
btree_gist.control	Convert contrib modules to use the extension facility.	15 years ago
btree_gist.h	Remove unnecessary #include references, per pgrminclude script.	14 years ago
btree_inet.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_int2.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_int4.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_int8.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_interval.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_macaddr.c	Fix a second cause of undersized pallocs for btree_gist indexes on macaddr.	11 years ago
btree_numeric.c	Create function prototype as part of PG_FUNCTION_INFO_V1 macro	11 years ago
btree_oid.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_text.c	Create function prototype as part of PG_FUNCTION_INFO_V1 macro	11 years ago
btree_time.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_ts.c	Support timezone abbreviations that sometimes change.	11 years ago
btree_utils_num.c	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_utils_num.h	Fix valgrind warning for btree_gist indexes on macaddr.	11 years ago
btree_utils_var.c	Suppress some more valgrind whining about btree_gist.	11 years ago
btree_utils_var.h	Remove unnecessary #include references, per pgrminclude script.	14 years ago