Horton

Re: Add SPLIT PARTITION/MERGE PARTITIONS commands

jian he <jian.universality@gmail.com>

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From: jian he <jian.universality@gmail.com>
To: Dmitry Koval <d.koval@postgrespro.ru>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2025-10-15T11:34:37Z
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.

Attachments

hi.

please check the attach doc refactor for v62-0001.

            if (found_whole_row && attribute->attgenerated != '\0')
                ereport(ERROR,
                        errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                        errmsg("cannot convert whole-row table reference"),
                        errdetail("Generation expression for column
\"%s\" contains a whole-row reference to table \"%s\".",
                                  NameStr(attribute->attname),
                                  RelationGetRelationName(parent_rel)));

here ereport should be elog(ERROR...).
since this error should be unreachable. see check_nested_generated, cookDefault.

        /*
         * For the moment we have to reject whole-row variables (as for LIKE
         * and inheritances).
         */
        if (found_whole_row)
            elog(ERROR, "Constraint \"%s\" contains a whole-row
reference to table \"%s\".",
                 ccname,
                 RelationGetRelationName(parent_rel));

"table \"%s\".", we don't need that extra period.

"(as for LIKE and inheritances)":
I think you meant, “CREATE TABLE LIKE and table inheritance reject
whole-row check constraint, here we will do the same”.
maybe change to ""(as for CREATE TABLE LIKE and inheritances)".

Overall, I found v62-0001 code makes sense to me.