postgresql/contrib
Tom Lane 6ef77cf46e Further adjust EXPLAIN's choices of table alias names.
This patch causes EXPLAIN to always assign a separate table alias to the
parent RTE of an append relation (inheritance set); before, such RTEs
were ignored if not actually scanned by the plan.  Since the child RTEs
now always have that same alias to start with (cf. commit 55a1954da),
the net effect is that the parent RTE usually gets the alias used or
implied by the query text, and the children all get that alias with "_N"
appended.  (The exception to "usually" is if there are duplicate aliases
in different subtrees of the original query; then some of those original
RTEs will also have "_N" appended.)

This results in more uniform output for partitioned-table plans than
we had before: the partitioned table itself gets the original alias,
and all child tables have aliases with "_N", rather than the previous
behavior where one of the children would get an alias without "_N".

The reason for giving the parent RTE an alias, even if it isn't scanned
by the plan, is that we now use the parent's alias to qualify Vars that
refer to an appendrel output column and appear above the Append or
MergeAppend that computes the appendrel.  But below the append, Vars
refer to some one of the child relations, and are displayed that way.
This seems clearer than the old behavior where a Var that could carry
values from any child relation was displayed as if it referred to only
one of them.

While at it, change ruleutils.c so that the code paths used by EXPLAIN
deal in Plan trees not PlanState trees.  This effectively reverts a
decision made in commit 1cc29fe7c, which seemed like a good idea at
the time to make ruleutils.c consistent with explain.c.  However,
it's problematic because we'd really like to allow executor startup
pruning to remove all the children of an append node when possible,
leaving no child PlanState to resolve Vars against.  (That's not done
here, but will be in the next patch.)  This requires different handling
of subplans and initplans than before, but is otherwise a pretty
straightforward change.

Discussion: https://postgr.es/m/001001d4f44b$2a2cca50$7e865ef0$@lab.ntt.co.jp
2019-12-11 17:05:18 -05:00
..
adminpack Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
amcheck Pass ItemPointer not HeapTuple to IndexBuildCallback. 2019-11-08 11:49:29 -08:00
auth_delay
auto_explain Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
bloom Make the order of the header file includes consistent. 2019-11-25 08:08:57 +05:30
btree_gin Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
btree_gist Make the order of the header file includes consistent. 2019-11-25 08:08:57 +05:30
citext Fix typos in various places 2019-06-03 13:44:03 +09:00
cube Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
dblink libq support for sslpassword connection param, DER format keys 2019-11-30 15:27:13 -05:00
dict_int Ensure maxlen is at leat 1 in dict_int 2019-12-03 18:40:07 +01:00
dict_xsyn Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
earthdistance
file_fdw Represent Lists as expansible arrays, not chains of cons-cells. 2019-07-15 13:41:58 -04:00
fuzzystrmatch Remove useless "return;" lines 2019-11-28 16:48:37 -03:00
hstore Add reusable routine for making arrays unique. 2019-11-07 17:00:48 +13:00
hstore_plperl Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
hstore_plpython Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
intagg
intarray Add reusable routine for making arrays unique. 2019-11-07 17:00:48 +13:00
isn Make the order of the header file includes consistent in contrib modules. 2019-10-24 08:05:34 +05:30
jsonb_plperl Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
jsonb_plpython Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
lo
ltree Remove useless "return;" lines 2019-11-28 16:48:37 -03:00
ltree_plpython Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
oid2name Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
pageinspect Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
passwordcheck Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
pg_buffercache Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
pg_freespacemap Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
pg_prewarm Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
pg_standby Remove useless "return;" lines 2019-11-28 16:48:37 -03:00
pg_stat_statements Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
pg_trgm Add reusable routine for making arrays unique. 2019-11-07 17:00:48 +13:00
pg_visibility Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
pgcrypto Remove useless "return;" lines 2019-11-28 16:48:37 -03:00
pgrowlocks Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
pgstattuple Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
postgres_fdw Further adjust EXPLAIN's choices of table alias names. 2019-12-11 17:05:18 -05:00
seg Remove useless "return;" lines 2019-11-28 16:48:37 -03:00
sepgsql Remove useless "return;" lines 2019-11-28 16:48:37 -03:00
spi Make the order of the header file includes consistent in contrib modules. 2019-10-24 08:05:34 +05:30
sslinfo Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
start-scripts
tablefunc Make the order of the header file includes consistent in contrib modules. 2019-10-24 08:05:34 +05:30
tcn Make the order of the header file includes consistent in contrib modules. 2019-10-24 08:05:34 +05:30
test_decoding Add logical_decoding_work_mem to limit ReorderBuffer memory usage. 2019-11-19 07:32:36 +05:30
tsm_system_rows Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
tsm_system_time Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
unaccent Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
uuid-ossp Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
vacuumlo Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
xml2 Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
contrib-global.mk
Makefile
README

The PostgreSQL contrib tree
---------------------------

This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree.  This does not preclude their
usefulness.

User documentation for each module appears in the main SGML
documentation.

When building from the source distribution, these modules are not
built automatically, unless you build the "world" target.  You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.

Some directories supply new user-defined functions, operators, or
types.  To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command.  In a fresh database,
you can simply do

    CREATE EXTENSION module_name;

See the PostgreSQL documentation for more information about this
procedure.