Horton

Re: Add SPLIT PARTITION/MERGE PARTITIONS commands

Alexander Korotkov <aekorotkov@gmail.com>

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From: Alexander Korotkov <aekorotkov@gmail.com>
To: Alexander Lakhin <exclusion@gmail.com>
Cc: Dmitry Koval <d.koval@postgrespro.ru>, pgsql-hackers@lists.postgresql.org
Date: 2024-04-07T22:15:06Z
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!

On Sun, Apr 7, 2024 at 10:00 PM Alexander Lakhin <exclusion@gmail.com> wrote:
> 07.04.2024 01:22, Alexander Korotkov wrote:
> > I've pushed 0001 and 0002.  I didn't push 0003 for the following reasons.
>
> Please try the following (erroneous) query:
> CREATE TABLE t1(i int, t text) PARTITION BY LIST (t);
> CREATE TABLE t1pa PARTITION OF t1 FOR VALUES IN ('A');
>
> CREATE TABLE t2 (i int, t text) PARTITION BY RANGE (t);
> ALTER TABLE t2 SPLIT PARTITION t1pa INTO
>    (PARTITION t2a FOR VALUES FROM ('A') TO ('B'),
>     PARTITION t2b FOR VALUES FROM ('B') TO ('C'));
>
> that triggers an assertion failure:
> TRAP: failed Assert("datums != NIL"), File: "partbounds.c", Line: 3434, PID: 1841459
>
> or a segfault (in a non-assert build):
> Program terminated with signal SIGSEGV, Segmentation fault.
>
> #0  pg_detoast_datum_packed (datum=0x0) at fmgr.c:1866
> 1866            if (VARATT_IS_COMPRESSED(datum) || VARATT_IS_EXTERNAL(datum))
> (gdb) bt
> #0  pg_detoast_datum_packed (datum=0x0) at fmgr.c:1866
> #1  0x000055f38c5d5e3f in bttextcmp (...) at varlena.c:1834
> #2  0x000055f38c6030dd in FunctionCall2Coll (...) at fmgr.c:1161
> #3  0x000055f38c417c83 in partition_rbound_cmp (...) at partbounds.c:3525
> #4  check_partition_bounds_for_split_range (...) at partbounds.c:5221
> #5  check_partitions_for_split (...) at partbounds.c:5688
> #6  0x000055f38c256c49 in transformPartitionCmdForSplit (...) at parse_utilcmd.c:3451
> #7  transformAlterTableStmt (...) at parse_utilcmd.c:3810
> #8  0x000055f38c2bdf9c in ATParseTransformCmd (...) at tablecmds.c:5650

Thank you for spotting this.  This seems like a missing check.  I'm
going to get a closer look at this tomorrow.

------
Regards,
Alexander Korotkov