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Tom Lane 6b0faf7236 Make collation-aware system catalog columns use "C" collation. 
Up to now we allowed text columns in system catalogs to use collation
"default", but that isn't really safe because it might mean something
different in template0 than it means in a database cloned from template0.
In particular, this could mean that cloned pg_statistic entries for such
columns weren't entirely valid, possibly leading to bogus planner
estimates, though (probably) not any outright failures.

In the wake of commit 5e0928005, a better solution is available: if we
label such columns with "C" collation, then their pg_statistic entries
will also use that collation and hence will be valid independently of
the database collation.

This also provides a cleaner solution for indexes on such columns than
the hack added by commit 0b28ea79c: the indexes will naturally inherit
"C" collation and don't have to be forced to use text_pattern_ops.

Also, with the planned improvement of type "name" to be collation-aware,
this policy will apply cleanly to both text and name columns.

Because of the pg_statistic angle, we should also apply this policy
to the tables in information_schema.  This patch does that by adjusting
information_schema's textual domain types to specify "C" collation.
That has the user-visible effect that order-sensitive comparisons to
textual information_schema view columns will now use "C" collation
by default.  The SQL standard says that the collation of those view
columns is implementation-defined, so I think this is legal per spec.
At some point this might allow for translation of such comparisons
into indexable conditions on the underlying "name" columns, although
additional work will be needed before that can happen.

Discussion: https://postgr.es/m/19346.1544895309@sss.pgh.pa.us
 		2018-12-18 12:48:15 -05:00
..
authentication Clarify the README files for the various separate TAP-based test suites. 2018-06-19 19:30:50 -04:00
examples Fix spelling errors and typos in comments 2018-11-02 13:56:52 +01:00
isolation Raise some timeouts to 180s, in test code. 2018-12-10 20:15:42 -08:00
kerberos Make "kerberos" test suite independent of "localhost" name resolution. 2018-08-03 20:53:25 -07:00
ldap Fix handling of HBA ldapserver with multiple hostnames. 2018-11-13 17:46:28 +13:00
locale Add a temp-install prerequisite to "check"-like targets not having one. 2017-11-05 18:51:08 -08:00
mb Fix MB regression tests for WAL-logging of hash indexes. 2017-03-15 07:25:36 -04:00
modules Fix test_rls_hooks to assign expression collations properly. 2018-12-11 11:48:00 -05:00
perl Integrate recovery.conf into postgresql.conf 2018-11-25 16:33:40 +01:00
recovery Raise some timeouts to 180s, in test code. 2018-12-10 20:15:42 -08:00
regress Make collation-aware system catalog columns use "C" collation. 2018-12-18 12:48:15 -05:00
ssl Update ssl test certificates and keys 2018-11-27 15:16:14 +01:00
subscription Fix spelling errors and typos in comments 2018-11-02 13:56:52 +01:00
thread Incorporate strerror_r() into src/port/snprintf.c, too. 2018-09-26 12:35:57 -04:00
Makefile Revert "Allow on-line enabling and disabling of data checksums" 2018-04-09 19:03:42 +02:00
README Add TAP tests for password-based authentication methods. 2017-03-17 11:34:16 +02:00

README 

PostgreSQL tests
================

This directory contains a variety of test infrastructure as well as some of the
tests in PostgreSQL. Not all tests are here -- in particular, there are more in
individual contrib/ modules and in src/bin.

Not all these tests get run by "make check". Check src/test/Makefile to see
which tests get run automatically.

authentication/
  Tests for authentication

examples/
  Demonstration programs for libpq that double as regression tests via
  "make check"

isolation/
  Tests for concurrent behavior at the SQL level

locale/
  Sanity checks for locale data, encodings, etc

mb/
  Tests for multibyte encoding (UTF-8) support

modules/
  Extensions used only or mainly for test purposes, generally not suitable
  for installing in production databases

perl/
  Infrastructure for Perl-based TAP tests

recovery/
  Test suite for recovery and replication

regress/
  PostgreSQL's main regression test suite, pg_regress

ssl/
  Tests to exercise and verify SSL certificate handling

subscription/
  Tests for logical replication

thread/
  A thread-safety-testing utility used by configure