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086ffddf36
Several combinations of generated columns and inheritance in CREATE
TABLE were not handled correctly. Specifically:
- Disallow a child column specifying a generation expression if the
parent column is a generated column. The child column definition
must be unadorned and the parent column's generation expression will
be copied.
- Prohibit a child column of a generated parent column specifying
default values or identity.
- Allow a child column of a not-generated parent column specifying
itself as a generated column. This previously did not work, but it
was possible to arrive at the state via other means (involving ALTER
TABLE), so it seems sensible to support it.
Add tests for each case. Also add documentation about the rules
involving generated columns and inheritance.
Discussion:
https://www.postgresql.org/message-id/flat/15830.1575468847%40sss.pgh.pa.us
https://www.postgresql.org/message-id/flat/2678bad1-048f-519a-ef24-b12962f41807%40enterprisedb.com
https://www.postgresql.org/message-id/flat/CAJvUf_u4h0DxkCMCeEKAWCuzGUTnDP-G5iVmSwxLQSXn0_FWNQ%40mail.gmail.com
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.