Tom Lane 4387cf956b Avoid inserting Result nodes that only compute identity projections. ... The planner sometimes inserts Result nodes to perform column projections (ie, arbitrary scalar calculations) above plan nodes that lack projection logic of their own. However, we did that even if the lower plan node was in fact producing the required column set already; which is a pretty common case given the popularity of "SELECT * FROM ...". Measurements show that the useless plan node adds non-negligible overhead, especially when there are many columns in the result. So add a check to avoid inserting a Result node unless there's something useful for it to do. There are a couple of remaining places where unnecessary Result nodes could get inserted, but they are (a) much less performance-critical, and (b) coded in such a way that it's hard to avoid inserting a Result, because the desired tlist is changed on-the-fly in subsequent logic. We'll leave those alone for now. Kyotaro Horiguchi; reviewed and further hacked on by Amit Kapila and Tom Lane.		2013-03-14 13:43:18 -04:00
..
access	Fix tli history file fetching, broken by the archive after crash recevery patch.	2013-03-07 12:33:24 +02:00
bootstrap	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
catalog	Add cost estimation of range @> and <@ operators.	2013-03-14 15:36:56 +02:00
commands	Fix missing #include in commands/matview.h.	2013-03-06 18:21:05 -05:00
common	Move relpath() to libpgcommon	2013-02-21 22:46:17 -03:00
datatype	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
executor	Add a materialized view relations.	2013-03-03 18:23:31 -06:00
foreign	Support writable foreign tables.	2013-03-10 14:16:02 -04:00
lib	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
libpq	Report pg_hba line number and contents when users fail to log in	2013-03-10 15:54:37 +01:00
mb	Add noreturn attributes to some error reporting functions	2013-02-12 07:13:22 -05:00
nodes	Support writable foreign tables.	2013-03-10 14:16:02 -04:00
optimizer	Avoid inserting Result nodes that only compute identity projections.	2013-03-14 13:43:18 -04:00
parser	Add a materialized view relations.	2013-03-03 18:23:31 -06:00
port	Add URLs to document why DLLIMPORT is needed on Windows.	2012-11-07 15:01:25 -05:00
portability	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
postmaster	Fix background workers for EXEC_BACKEND	2013-01-02 12:01:14 -03:00
regex	Re-implement extraction of fixed prefixes from regular expressions.	2012-07-10 14:54:37 -04:00
replication	Fix more issues with cascading replication and timeline switches.	2013-01-23 10:19:20 +02:00
rewrite	Get rid of any toast table when converting a table to a view.	2013-03-03 19:05:47 -05:00
snowball	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
storage	Add support for piping COPY to/from an external program.	2013-02-27 18:22:31 +02:00
tcop	Add a materialized view relations.	2013-03-03 18:23:31 -06:00
tsearch	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
utils	JSON generation improvements.	2013-03-10 17:35:36 -04:00
.gitignore	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	2012-10-07 21:52:43 -04:00
c.h	Move ExceptionalCondition back to postgres.h	2013-02-18 18:53:32 -03:00
fmgr.h	Add infrastructure for storing a VARIADIC ANY function's VARIADIC flag.	2013-01-21 20:26:15 -05:00
funcapi.h	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
getaddrinfo.h	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
getopt_long.h	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
Makefile	Install headers from the new src/include/common subdirectory.	2013-02-26 15:27:30 -05:00
miscadmin.h	Make sure MaxBackends is always set	2013-01-02 14:39:11 -03:00
pg_config.h.in	Improve handling of ereport(ERROR) and elog(ERROR).	2013-01-13 18:40:09 -05:00
pg_config.h.win32	Improve handling of ereport(ERROR) and elog(ERROR).	2013-01-13 18:40:09 -05:00
pg_config_ext.h.in	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	2012-10-07 21:52:43 -04:00
pg_config_ext.h.win32	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	2012-10-07 21:52:43 -04:00
pg_config_manual.h	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
pg_trace.h	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
pgstat.h	Split pgstat file in smaller pieces	2013-02-18 18:12:52 -03:00
pgtar.h	Move tar function headers to pgtar.h	2013-01-02 20:34:08 +01:00
pgtime.h	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
port.h	Add support for piping COPY to/from an external program.	2013-02-27 18:22:31 +02:00
postgres.h	Move ExceptionalCondition back to postgres.h	2013-02-18 18:53:32 -03:00
postgres_ext.h	Provide database object names as separate fields in error messages.	2013-01-29 17:08:26 -05:00
postgres_fe.h	Create libpgcommon, and move pg_malloc et al to it	2013-02-12 11:21:05 -03:00
rusagestub.h	Update copyrights for 2013	2013-01-01 17:15:01 -05:00
windowapi.h	Update copyrights for 2013	2013-01-01 17:15:01 -05:00