Horton

RE: Support logical replication of DDLs

Wei Wang (Fujitsu) <wangw.fnst@fujitsu.com>

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From: "Wei Wang (Fujitsu)" <wangw.fnst@fujitsu.com>
To: shveta malik <shveta.malik@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>
Cc: "Yu Shi (Fujitsu)" <shiy.fnst@fujitsu.com>, vignesh C <vignesh21@gmail.com>, "Zhijie Hou (Fujitsu)" <houzj.fnst@fujitsu.com>, Ajin Cherian <itsajin@gmail.com>, Runqi Tian <runqidev@gmail.com>, Peter Smith <smithpb2250@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, li jie <ggysxcq@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Masahiko Sawada <sawada.mshk@gmail.com>, Japin Li <japinli@hotmail.com>, rajesh singarapu <rajesh.rs0541@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Zheng Li <zhengli10@gmail.com>
Date: 2023-06-12T01:47:02Z
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. Add a run_as_owner option to subscriptions.

  2. Refactor pgoutput_change().

  3. Print the correct aliases for DML target tables in ruleutils.

  4. Fix object identity string for transforms

  5. Add grantable MAINTAIN privilege and pg_maintain role.

  6. Get rid of recursion-marker values in enum AlterTableType

  7. Release cache tuple when no longer needed

  8. Empty search_path in logical replication apply worker and walsender.

  9. Refactor format_type APIs to be more modular

  10. Use wrappers of PG_DETOAST_DATUM_PACKED() more.

On Thur, Jun 8, 2023 20:02 PM shveta malik <shveta.malik@gmail.com> wrote:
> Thank You Vignesh for handling (a), Ajin for handling (b), Shi-san and
> Hou-san for contributing in (c).
> 
> The new changes are in patch 0001, 0002, 0005 and 0008.

Thanks for updating the patch set.

Here are some comments:
===
For 0002 patch.
1. The typo atop the function EventTriggerTableInitWrite.
```
+/*
+ * Fire table_init_rewrite triggers.
+ */
+void
+EventTriggerTableInitWrite(Node *real_create, ObjectAddress address)
```
s/table_init_rewrite/table_init_write

~~~

2. The new process for "SCT_CreateTableAs" in the function pg_event_trigger_ddl_commands.
With the event trigger created in
test_ddl_deparse_regress/sql/test_ddl_deparse.sql, when creating the table that
already exists with `CreateTableAs` command, an error is raised like below:
```
postgres=# CREATE TABLE IF NOT EXISTS as_select1 AS SELECT * FROM pg_class WHERE relkind = 'r';
postgres=# CREATE TABLE IF NOT EXISTS as_select1 AS SELECT * FROM pg_class WHERE relkind = 'r';
NOTICE:  relation "as_select1" already exists, skipping
ERROR:  unrecognized object class: 0
CONTEXT:  PL/pgSQL function test_ddl_deparse() line 6 at FOR over SELECT rows
```
It seems that we could check cmd->d.ctas.real_create in the function
pg_event_trigger_ddl_commands and return NULL in this case.

===
For 0004 patch.
3. The command tags that are not supported for deparsing in the tests.
```
	FOR r IN SELECT * FROM pg_event_trigger_ddl_commands()
		-- Some TABLE commands generate sequence-related commands, also deparse them.
		WHERE command_tag in ('ALTER FOREIGN TABLE', 'ALTER TABLE',
							  'CREATE FOREIGN TABLE', 'CREATE TABLE',
							  'CREATE TABLE AS', 'DROP FOREIGN TABLE',
							  'DROP TABLE', 'ALTER SEQUENCE',
							  'CREATE SEQUENCE', 'DROP SEQUENCE')
```
Since foreign table is not supported yet in the current patch set, it seems that
we need to remove "FOREIGN TABLE" related command tag. If so, I think the
following three files need to be modified:
- test_ddl_deparse_regress/sql/test_ddl_deparse.sql
- test_ddl_deparse_regress/t/001_compare_dumped_results.pl
- test_ddl_deparse_regress/t/002_regress_tests.pl

~~~

4. The different test items between meson and Makefile.
It seems that we should keep the same SQL files and the same order of SQL files
in test_ddl_deparse_regress/meson.build and test_ddl_deparse_regress/Makefile.

===
For 0004 && 0008 patches.
5. The test cases in the test file test_ddl_deparse_regress/t/001_compare_dumped_results.pl.
```
# load test cases from the regression tests
-my @regress_tests = split /\s+/, $ENV{REGRESS};
+#my @regress_tests = split /\s+/, $ENV{REGRESS};
+my @regress_tests = ("create_type", "create_schema", "create_rule", "create_index");
```
I think @regress_tests should include all SQL files, instead of just four. BTW,
the old way (using `split /\s+/, $ENV{REGRESS}`) doesn't work in meson.

Regards,
Wang wei