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When using ALTER TABLE ... ADD CONSTRAINT to add a not-null constraint with an explicit name, we have to ensure that if the column is already marked NOT NULL, the provided name matches the existing constraint name. Failing to do so could lead to confusion regarding which constraint object actually enforces the rule. This patch adds a check to throw an error if the user tries to add a named not-null constraint to a column that already has one with a different name. Reported-by: yanliang lei <msdnchina@163.com> Co-authored-by: Álvaro Herrera <alvherre@kurilemu.de> Co-authored-bu: Srinath Reddy Sadipiralla <srinath2133@gmail.com> Backpatch-through: 18 Discussion: https://postgr.es/m/19351-8f1c523ead498545%40postgresql.org
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