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Andres Freund 59b71c6fe6 Fix handling of NULLs returned by aggregate combine functions. 
When strict aggregate combine functions, used in multi-stage/parallel
aggregation, returned NULL, we didn't check for that, invoking the
combine function with NULL the next round, despite it being strict.

The equivalent code invoking normal transition functions has a check
for that situation, which did not get copied in a7de3dc5c3. Fix the
bug by adding the equivalent check.

Based on a quick look I could not find any strict combine functions in
core actually returning NULL, and it doesn't seem very likely external
users have done so. So this isn't likely to have caused issues in
practice.

Add tests verifying transition / combine functions returning NULL is
tested.

Reported-By: Andres Freund
Author: Andres Freund
Discussion: https://postgr.es/m/20171121033642.7xvmjqrl4jdaaat3@alap3.anarazel.de
Backpatch: 9.6, where parallel aggregation was introduced
 		2017-11-23 17:15:27 -08:00
..
authentication Post-PG 10 beta1 pgperltidy run 2017-05-17 19:01:23 -04:00
examples Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
isolation Build src/test/isolation during "make" and "make install". 2017-11-22 20:18:15 -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 Remove wal_keep_segments from default configuration in PostgresNode.pm 2017-11-02 12:38:59 -04:00
recovery Remove redundant line from Makefile. 2017-11-16 15:30:56 -05:00
regress Fix handling of NULLs returned by aggregate combine functions. 2017-11-23 17:15:27 -08:00
ssl Support channel binding 'tls-unique' in SCRAM 2017-11-18 10:15:54 -05:00
subscription Don't reset additional columns on subscriber to NULL on UPDATE 2017-11-03 12:27:59 -04:00
thread Avoid use of bool in thread_test.c 2017-09-14 13:27:54 -04:00
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