postgresql/contrib
Tom Lane 9492cf86e4 Fix assorted fallout from IS [NOT] NULL patch.
Commits 4452000f3 et al established semantics for NullTest.argisrow that
are a bit different from its initial conception: rather than being merely
a cache of whether we've determined the input to have composite type,
the flag now has the further meaning that we should apply field-by-field
testing as per the standard's definition of IS [NOT] NULL.  If argisrow
is false and yet the input has composite type, the construct instead has
the semantics of IS [NOT] DISTINCT FROM NULL.  Update the comments in
primnodes.h to clarify this, and fix ruleutils.c and deparse.c to print
such cases correctly.  In the case of ruleutils.c, this merely results in
cosmetic changes in EXPLAIN output, since the case can't currently arise
in stored rules.  However, it represents a live bug for deparse.c, which
would formerly have sent a remote query that had semantics different
from the local behavior.  (From the user's standpoint, this means that
testing a remote nested-composite column for null-ness could have had
unexpected recursive behavior much like that fixed in 4452000f3.)

In a related but somewhat independent fix, make plancat.c set argisrow
to false in all NullTest expressions constructed to represent "attnotnull"
constructs.  Since attnotnull is actually enforced as a simple null-value
check, this is a more accurate representation of the semantics; we were
previously overpromising what it meant for composite columns, which might
possibly lead to incorrect planner optimizations.  (It seems that what the
SQL spec expects a NOT NULL constraint to mean is an IS NOT NULL test, so
arguably we are violating the spec and should fix attnotnull to do the
other thing.  If we ever do, this part should get reverted.)

Back-patch, same as the previous commit.

Discussion: <10682.1469566308@sss.pgh.pa.us>
2016-07-28 16:09:15 -04:00
..
adminpack Update copyright for 2016 2016-01-02 13:33:40 -05:00
auth_delay Update copyright for 2016 2016-01-02 14:19:48 -05:00
auto_explain pgindent run for 9.6 2016-06-09 18:02:36 -04:00
bloom Minor fixes in contrib installation scripts. 2016-06-14 10:47:06 -04:00
btree_gin Make contrib regression tests safe for Danish locale. 2016-07-21 16:52:35 -04:00
btree_gist Handle contrib's GIN/GIST support function signature changes honestly. 2016-06-09 16:44:25 -04:00
chkpass Avoid returning undefined bytes in chkpass_in(). 2015-02-14 12:20:56 -05:00
citext Repair damage done by citext--1.1--1.2.sql. 2016-07-26 15:32:57 -04:00
cube Update extensions with GIN/GIST support for parallel query. 2016-06-14 13:34:37 -04:00
dblink Establish conventions about global object names used in regression tests. 2016-07-17 18:42:43 -04:00
dict_int Update copyright for 2016 2016-01-02 13:33:40 -05:00
dict_xsyn Update copyright for 2016 2016-01-02 13:33:40 -05:00
earthdistance Message style improvements 2016-07-25 22:07:44 -04:00
file_fdw Establish conventions about global object names used in regression tests. 2016-07-17 18:42:43 -04:00
fuzzystrmatch Update fuzzystrmatch extension for parallel query. 2016-06-07 11:26:41 -04:00
hstore Update extensions with GIN/GIST support for parallel query. 2016-06-14 13:34:37 -04:00
hstore_plperl Minor fixes in contrib installation scripts. 2016-06-14 10:47:06 -04:00
hstore_plpython Minor fixes in contrib installation scripts. 2016-06-14 10:47:06 -04:00
intagg Schema-qualify some references to regprocedure. 2016-06-10 10:41:58 -04:00
intarray Update extensions with GIN/GIST support for parallel query. 2016-06-14 13:34:37 -04:00
isn pgindent run for 9.6 2016-06-09 18:02:36 -04:00
lo Update lo extension for parallel query. 2016-06-07 11:26:42 -04:00
ltree Update extensions with GIN/GIST support for parallel query. 2016-06-14 13:34:37 -04:00
ltree_plpython Minor fixes in contrib installation scripts. 2016-06-14 10:47:06 -04:00
oid2name Add file version information to most installed Windows binaries. 2014-07-14 14:07:52 -04:00
pageinspect pgindent run for 9.6 2016-06-09 18:02:36 -04:00
passwordcheck Update copyright for 2016 2016-01-02 13:33:40 -05:00
pg_buffercache Update pg_buffercache extension for parallel query. 2016-06-09 17:18:12 -04:00
pg_freespacemap Update pg_freespacemap extension for parallel query. 2016-06-09 17:18:16 -04:00
pg_prewarm Update pg_prewarm extension for parallel query. 2016-06-09 17:18:18 -04:00
pg_standby Don't use function definitions looking like old-style ones. 2015-08-15 17:25:00 +02:00
pg_stat_statements Update pg_stat_statements extension for parallel query. 2016-06-10 10:42:01 -04:00
pg_trgm pg_trgm's set_limit() function is parallel unsafe, not parallel restricted. 2016-06-20 11:29:54 -04:00
pg_visibility pg_visibility: Add pg_truncate_visibility_map function. 2016-06-17 17:37:30 -04:00
pgcrypto Minor fixes in contrib installation scripts. 2016-06-14 10:47:06 -04:00
pgrowlocks Fix handling of multixacts predating pg_upgrade 2016-06-24 18:29:28 -04:00
pgstattuple Minor fixes in contrib installation scripts. 2016-06-14 10:47:06 -04:00
postgres_fdw Fix assorted fallout from IS [NOT] NULL patch. 2016-07-28 16:09:15 -04:00
seg Update extensions with GIN/GIST support for parallel query. 2016-06-14 13:34:37 -04:00
sepgsql Establish conventions about global object names used in regression tests. 2016-07-17 18:42:43 -04:00
spi Widen query numbers-of-tuples-processed counters to uint64. 2016-03-12 16:05:29 -05:00
sslinfo Update sslinfo extension for parallel query. 2016-06-14 14:52:55 -04:00
start-scripts Fix typo in linux startup script. 2015-04-26 09:43:15 -04:00
tablefunc Widen query numbers-of-tuples-processed counters to uint64. 2016-03-12 16:05:29 -05:00
tcn Revert CREATE INDEX ... INCLUDING ... 2016-04-08 21:52:13 +03:00
test_decoding Establish conventions about global object names used in regression tests. 2016-07-17 18:42:43 -04:00
tsearch2 Make contrib regression tests safe for Danish locale. 2016-07-21 16:52:35 -04:00
tsm_system_rows Update copyright for 2016 2016-01-02 13:33:40 -05:00
tsm_system_time Update copyright for 2016 2016-01-02 13:33:40 -05:00
unaccent Update unaccent extension for parallel query. 2016-06-14 14:55:49 -04:00
uuid-ossp Update uuid-ossp extension for parallel query. 2016-06-14 14:56:21 -04:00
vacuumlo Update copyright for 2016 2016-01-02 13:33:40 -05:00
xml2 Update xml2 extension for parallel query. 2016-06-14 15:49:32 -04:00
Makefile Bloom index contrib module 2016-04-01 16:42:24 +03:00
README Rename 'gmake' to 'make' in docs and recommended commands 2014-02-12 17:29:19 -05:00
contrib-global.mk Respect TEMP_CONFIG when pg_regress_check and friends are called 2016-02-27 12:28:21 -05:00

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.