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David Rowley 3af7040985 Fix IS [NOT] NULL qual optimization for inheritance tables 
b262ad440 added code to have the planner remove redundant IS NOT NULL
quals and eliminate needless scans for IS NULL quals on tables where the
qual's column has a NOT NULL constraint.

That commit failed to consider that an inheritance parent table could
have differing NOT NULL constraints between the parent and the child.
This caused issues as if we eliminated a qual on the parent, when
applying the quals to child tables in apply_child_basequals(), the qual
might not have been added to the parent's baserestrictinfo.

Here we fix this by not applying the optimization to remove redundant
quals to RelOptInfos belonging to inheritance parents and applying the
optimization again in apply_child_basequals().  Effectively, this means
that the parent and child are considered independently as the parent has
both an inh=true and inh=false RTE and we still apply the optimization
to the RelOptInfo corresponding to the inh=false RTE.

We're able to still apply the optimization in add_base_clause_to_rel()
for partitioned tables as the NULLability of partitions must match that
of their parent.  And, if we ever expand restriction_is_always_false()
and restriction_is_always_true() to handle partition constraints then we
can apply the same logic as, even in multi-level partitioned tables,
there's no way to route values to a partition when the qual does not
match the partition qual of the partitioned table's parent partition.
The same is true for CHECK constraints as those must also match between
arent partitioned tables and their partitions.

Author: Richard Guo, David Rowley
Discussion: https://postgr.es/m/CAMbWs4930gQSZmjR7aANzEapdy61gCg6z8dT-kAEYD0sYWKPdQ@mail.gmail.com
 		2024-04-12 20:07:53 +12:00
..
authentication Update copyright for 2024 2024-01-03 20:49:05 -05:00
examples Update copyright for 2024 2024-01-03 20:49:05 -05:00
icu Address more review comments on commit 2d819a08a1. 2024-03-18 11:58:13 -07:00
isolation Implement ALTER TABLE ... SPLIT PARTITION ... command 2024-04-07 01:18:44 +03:00
kerberos Move Kerberos module 2024-04-08 02:49:30 +03:00
ldap Don't clobber test exit code at cleanup in LDAP/Kerberors tests 2024-04-07 20:21:27 +03:00
libpq_encryption Silence perlcritic warnings in new libpq tests 2024-04-08 04:32:26 +03:00
locale Update copyright for 2024 2024-01-03 20:49:05 -05:00
mb
…
modules Revert: Custom reloptions for table AM 2024-04-11 15:46:35 +03:00
perl Move Kerberos module 2024-04-08 02:49:30 +03:00
recovery Revert: Implement pg_wal_replay_wait() stored procedure 2024-04-11 17:28:15 +03:00
regress Fix IS [NOT] NULL qual optimization for inheritance tables 2024-04-12 20:07:53 +12:00
ssl Revert "Add notBefore and notAfter to SSL cert info display" 2024-03-22 22:58:41 +01:00
subscription Fix the intermittent buildfarm failures in 031_column_list. 2024-02-22 12:06:44 +05:30
Makefile Refactor PG_TEST_EXTRA logic in autoconf build 2022-09-20 11:24:16 -07:00
README Remove the option to build thread_test.c outside configure. 2020-10-21 12:08:48 -04:00
meson.build Add tests for libpq gssencmode and sslmode options 2024-04-08 02:49:32 +03:00

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 (but see also below)

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

isolation/
  Tests for concurrent behavior at the SQL level

kerberos/
  Tests for Kerberos/GSSAPI authentication and encryption

ldap/
  Tests for LDAP-based authentication

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