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This changes the pg_attribute field attstattarget into a nullable field in the variable-length part of the row. If no value is set by the user for attstattarget, it is now null instead of previously -1. This saves space in pg_attribute and tuple descriptors for most practical scenarios. (ATTRIBUTE_FIXED_PART_SIZE is reduced from 108 to 104.) Also, null is the semantically more correct value. The ANALYZE code internally continues to represent the default statistics target by -1, so that that code can avoid having to deal with null values. But that is now contained to the ANALYZE code. Only the DDL code deals with attstattarget possibly null. For system columns, the field is now always null. The ANALYZE code skips system columns anyway. To set a column's statistics target to the default value, the new command form ALTER TABLE ... SET STATISTICS DEFAULT can be used. (SET STATISTICS -1 still works.) Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> Discussion: https://www.postgresql.org/message-id/flat/4da8d211-d54d-44b9-9847-f2a9f1184c76@eisentraut.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