Horton

Re: Add SPLIT PARTITION/MERGE PARTITIONS commands

Alexander Lakhin <exclusion@gmail.com>

View thread
From: Alexander Lakhin <exclusion@gmail.com>
To: Alexander Korotkov <aekorotkov@gmail.com>, Dmitry Koval <d.koval@postgrespro.ru>
Cc: Robert Haas <robertmhaas@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2024-04-18T16:00:00Z
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. Adjust errcode in checkPartition()

  2. Fix usage of palloc() in MERGE/SPLIT PARTITION(s) code

  3. Implement ALTER TABLE ... SPLIT PARTITION ... command

  4. Implement ALTER TABLE ... MERGE PARTITIONS ... command

  5. Calculate agglevelsup correctly when Aggref contains a CTE.

  6. Use PqMsg_* macros in applyparallelworker.c.

  7. Restrict psql meta-commands in plain-text dumps.

  8. Ensure we have a snapshot when updating various system catalogs.

  9. Use specific collation where needed in new test

  10. Expand virtual generated columns in the planner

  11. Virtual generated columns

  12. Define PG_LOGICAL_DIR for path pg_logical/ in data folder

  13. Revert support for ALTER TABLE ... MERGE/SPLIT PARTITION(S) commands

  14. Avoid repeated table name lookups in createPartitionTable()

  15. Provide deterministic order for catalog queries in partition_split.sql

  16. Don't copy extended statistics during MERGE/SPLIT partition operations

  17. Fix the name collision detection in MERGE/SPLIT partition operations

  18. Fix regression tests conflict in 3ca43dbbb6

  19. Add permission check for MERGE/SPLIT partition operations

  20. Fix one more portability shortcoming in new test_pg_dump test.

  21. Inherit parent's AM for partition MERGE/SPLIT operations

  22. Add tab completion for partition MERGE/SPLIT operations

  23. Rename tables in tests of partition MERGE/SPLIT operations

  24. Make new partitions with parent's persistence during MERGE/SPLIT

  25. Document the way partition MERGE/SPLIT operations create new partitions

  26. Change the way ATExecMergePartitions() handles the name collision

  27. Grammar fixes for split/merge partitions code

  28. Checks for ALTER TABLE ... SPLIT/MERGE PARTITIONS ... commands

  29. Fix some grammer errors from error messages and codes comments

  30. Support TZ and OF format codes in to_timestamp().

  31. Support identity columns in partitioned tables

  32. Fix indentation in twophase.c

  33. Fix corner-case planner failure for MERGE.

  34. Doc: fix documentation example for bytea hex output format.

  35. Avoid repeated name lookups during table and index DDL.

Hi Alexander,

18.04.2024 13:35, Alexander Korotkov wrote:
>
> The revised patchset is attached.
> 1) I've split the fix for the CommandCounterIncrement() issue and the
> fix for relation persistence issue into a separate patch.
> 2) I've validated that the lock on the new partition is held in
> createPartitionTable() after ProcessUtility() as pointed out by
> Robert.  So, no need to place the lock again.
> 3) Added fix for problematic error message as a separate patch [1].
> 4) Added rename "salemans" => "salesmen" for tests as a separate patch.
>
> I think these fixes are reaching committable shape, but I'd like
> someone to check it before I push.

I think the feature implementation should also provide tab completion for
SPLIT/MERGE.
(ALTER TABLE t S<Tab>
fills in only SET now.)

Also, the following MERGE operation:
CREATE TABLE t (i int, PRIMARY KEY(i)) PARTITION BY RANGE (i);
CREATE TABLE tp_0 PARTITION OF t FOR VALUES FROM (0) TO (1);
CREATE TABLE tp_1 PARTITION OF t FOR VALUES FROM (1) TO (2);
ALTER TABLE t MERGE PARTITIONS (tp_0, tp_1) INTO tp_0;

leaves a strange constraint:
\d+ t*
                                           Table "public.tp_0"
...
Not-null constraints:
     "merge-16385-26BCB0-tmp_i_not_null" NOT NULL "i"

Best regards,
Alexander