Horton

Re: First draft of PG 17 release notes

David Rowley <dgrowleyml@gmail.com>

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From: David Rowley <dgrowleyml@gmail.com>
To: Andy Fan <zhihuifan1213@163.com>
Cc: Bruce Momjian <bruce@momjian.us>, PostgreSQL-development <pgsql-hackers@postgresql.org>, pgsql-hackers@lists.postgresql.org
Date: 2024-05-11T05:57:31Z
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. Revert support for ALTER TABLE ... MERGE/SPLIT PARTITION(S) commands

  2. When creating materialized views, use REFRESH to load data.

  3. Revert temporal primary keys and foreign keys

  4. Avoid needless large memcpys in libpq socket writing

  5. Enhance nbtree ScalarArrayOp execution.

  6. Introduce a non-recursive JSON parser

  7. Combine freezing and pruning steps in VACUUM

  8. Allow SIGINT to cancel psql database reconnections.

  9. Provide API for streaming relation data.

  10. Add hash support functions and hash opclass for contrib/ltree.

  11. Pull up ANY-SUBLINK with the necessary lateral support.

  12. Read WAL directly from WAL buffers.

  13. Introduce the dynamic shared memory registry.

  14. Add macros for looping through a List without a ListCell.

  15. Support +/- infinity in the interval data type.

  16. Extend ALTER OPERATOR to allow setting more optimization attributes.

  17. Consider cheap startup paths in add_paths_to_append_rel

On Sat, 11 May 2024 at 17:32, Andy Fan <zhihuifan1213@163.com> wrote:
> Do you think we need to add the following 2 items?
>
> - 9f133763961e280d8ba692bcad0b061b861e9138 this is an optimizer
>   transform improvement.

I think this should be in the release notes.

Suggest:

* Allow correlated IN subqueries to be transformed into joins (Andy
Fan, Tom Lane)

> - a8a968a8212ee3ef7f22795c834b33d871fac262 this is an optimizer costing
>   improvement.
>
> Both of them can generate a better plan on some cases.

I think this should be present too.

Suggest:

* Improve optimizer's ability to use cheap startup plans when querying
partitioned tables, inheritance parents and for UNION ALL (Andy Fan,
David Rowley)

Both under "E.1.3.1.1. Optimizer"

David