Horton

Re: First draft of PG 17 release notes

Jelte Fennema-Nio <postgres@jeltef.nl>

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From: Jelte Fennema-Nio <postgres@jeltef.nl>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Bruce Momjian <bruce@momjian.us>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2024-05-11T13:57:49Z
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 Fri, 10 May 2024 at 23:31, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Bruce Momjian <bruce@momjian.us> writes:
> > I looked at both of these.   In both cases I didn't see why the user
> > would need to know these changes were made:
>
> I agree that the buffering change is not likely interesting, but
> the fact that you can now control-C out of a psql "\c" command
> is user-visible.  People might have internalized the fact that
> it didn't work, or created complicated workarounds.

The buffering change improved performance up to ~40% in some of the
benchmarks. The case it improves mostly is COPY of large rows and
streaming a base backup. That sounds user-visible enough to me to
warrant an entry imho.