Re: Virtual generated columns

Peter Eisentraut <peter@eisentraut.org>

From: Peter Eisentraut <peter@eisentraut.org>
To: pgsql-hackers <pgsql-hackers@postgresql.org>
Cc: jian he <jian.universality@gmail.com>, Dean Rasheed <dean.a.rasheed@gmail.com>
Date: 2024-11-29T10:13:45Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →
  1. Expand virtual generated columns for ALTER COLUMN TYPE

  2. Eliminate code duplication in replace_rte_variables callbacks

  3. Expand virtual generated columns in the planner

  4. Virtual generated columns

  5. Additional tests for stored generated columns

  6. Improve generated_stored test

  7. Fix handling of CREATE DOMAIN with GENERATED constraint syntax

  8. Add pg_constraint rows for not-null constraints

  9. Put generated_stored test objects in a schema

  10. Rename regress test generated to generated_stored

  11. Small code simplification

  12. Remove useless code

  13. Remove useless initializations

  14. doc: Clarify that pg_attrdef also stores generation expressions

  15. Clean out column-level pg_init_privs entries when dropping tables.

  16. Re-implement the ereport() macro using __VA_ARGS__.

Attachments

Here is a new patch version, with several updates.

- Expanded the commit message.

- Added more documentation on storage of virtual columns.

- Added more documentation and tests on security and access privilege 
questions.  (The functionality itself has not changed.)

- Added support for ALTER TABLE ... SET EXPRESSION.

- Added support for virtual columns in trigger column lists.  (For that, 
I renamed ExecInitStoredGenerated() to ExecInitGenerated(), which 
handles the computation of ri_extraUpdatedCols.)

- Correctly prevent not-null constraints on virtual columns in all cases 
(see nearby message).

- Expand virtual columns when checking publication row filter 
expressions (see nearby message).  Also added tests in 028_row_filter.pl.

According to my notes, this is now feature complete and has no glaring 
unsolved problems known to me.