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Tom Lane c4c2885cbb Fix UNION/INTERSECT/EXCEPT over no columns. 
Since 9.4, we've allowed the syntax "select union select" and variants
of that.  However, the planner wasn't expecting a no-column set operation
and ended up treating the set operation as if it were UNION ALL.

Turns out it's trivial to fix in v10 and later; we just need to be careful
about not generating a Sort node with no sort keys.  However, since a weird
corner case like this is never going to be exercised by developers, we'd
better have thorough regression tests if we want to consider it supported.

Per report from Victor Yegorov.

Discussion: https://postgr.es/m/CAGnEbojGJrRSOgJwNGM7JSJZpVAf8xXcVPbVrGdhbVEHZ-BUMw@mail.gmail.com
2017-12-22 12:08:06 -05:00
..
authentication Avoid and detect SIGPIPE race in TAP tests. 2017-12-16 10:03:35 -08:00
examples Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
isolation Fix pruning of locked and updated tuples. 2017-12-14 18:20:47 -08:00
ldap Log diagnostic messages if errors occur during LDAP auth. 2017-10-12 22:37:14 -04:00
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 Back out the session_start and session_end hooks feature. 2017-11-16 11:35:02 -05:00
perl Avoid putting build-location-dependent strings into generated files. 2017-12-21 10:57:06 -05:00
recovery Remove redundant line from Makefile. 2017-11-16 15:30:56 -05:00
regress Fix UNION/INTERSECT/EXCEPT over no columns. 2017-12-22 12:08:06 -05:00
ssl Add libpq connection parameter "scram_channel_binding" 2017-12-19 10:12:36 -05:00
subscription Don't reset additional columns on subscriber to NULL on UPDATE 2017-11-03 12:27:59 -04:00
thread Update typedefs.list and re-run pgindent 2017-11-29 09:24:24 -05:00
Makefile Add LDAP authentication test suite 2017-09-15 11:44:29 -04:00
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